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{gateways7}Sea Prowler
Creature - Merfolk Cat
When Sea Prowler enters the battlefield or attacks, return target creature to its owner's hand.
Its footsteps cause waves that beach ships and flood cities.
3/2

It's fairly simple enough. It gets removed easily, and if it's the only creature it bounces itself. I think this might be a bit too powerful as an uncommon, but too weak as a rare. I'd push it up to rare to keep it from being too troublesome in draft.

{viriss}Twilight Eidolon
Enchantment Creature - Spirit
Bestow
Shadow
Enchanted creature gets +2/+2 and has shadow.
2/2

Hmm. Bringing back shadow? Maybe in a commander set, but definitely not anywhere else. Shadow is ranked 7 on the Storm Scale, so it's...possible. Bestow and shadow? Unlikely to see print. Bestow cost is fine, but its mana cost should be or so.

{Tesagk}Feleviathan
Legendary Creature - Cat Leviathan God
Hexproof, indestructible
This spell can't be countered.
Lands do not untap during their owner's untap step.
When Feleviathan enters the battlefield, tap all lands.
Tap a creature you control: Untap target land. Any player may activate this ability.
"There was one final roar - and then darkness. That was it."
8/8

Even with that mana cost I don't think this would see print. Hexproof and indestructible on a card is just too good, not to mention can't be countered and the land tapping abilities. Remove hexproof or indestructible, which rarely gets anyway (it is a God, though...), and the land freeze (tapping them is fine)...why don't I just show you?

Feleviathan
Legendary Creature - Cat Leviathan
Islandwalk
This spell can't be countered.
When Feleviathan enters the battlefield, tap all lands you don't control. They don't untap during their controller's next untap step.
Tap a creature you control: Untap target land. Any player may activate this ability.
There was one final roar - and then darkness.
8/8

A little different than what you entered. I felt it wasn't God-y enough to warrant the type, and that took off indestructible. Islandwalk made more sense than hexproof, and made it easier to interact with (so you don't just lock someone out with Conjurer's Closet.) I think I kept the same spirit.

{jynx316}The Cat of Ulthar
Legendary Planeswalker - Atal
: Create X 1/1 black Cat creature tokens, where X is the number of loyalty counters on The Cat of Ulthar.
: All Cats get +2/+2 and gain trample until end of turn.
: You get an emblem with "As long as you control a Cat creature, you can't lose the game and your opponents can't win the game."


Minor detail: the planeswalker type isn't in the name. The is way too strong; you're getting a minimum of six tokens the first turn, then an additional seven on the second. Even Elspeth, Sun's Champion only makes three for ; it should be a or just create a set number. The ultimate is a bit weird for ; it's similar to Abyssal Persecutor but that's more the realm of .

{zuty}Dockside Fountain
Artifact
At the beginning of your upkeep, if you control an Island, scry 1.
, Sacrifice Dockside Fountain: Draw a card.

Ah, this makes me happy. You focused on a detail instead of the main focus, and made a playable card out of it. I have no suggestions to make. Good job.

{mrlozano}Crasius, Dream of the Horizon
Legendary Enchantment Creature - Avatar
Indestructible
As long as your devotion to white is three or less, your devotion to blue is three or less, and your devotion to black is two or less Crasius isn't a creature.
If a player would gain life, that player loses that much life instead.
: Target creature gains lifelink until end of turn.
7/1

Ehhhhh. This...is a problem. There is no reason for it to be an enchantment unless it's Therosian, and then it should be a God (as it has indestructible), which brings up an issue with the name, as horizons are Kruphix's domain. The devotion should be "devotion to white, blue, and black is greater than nine" if it is kept. There is no indication of on this card; life manipulation is the realm of and sometimes . Allow me to suggest some changes:

Crasius, Dream of the Horizon
Legendary Creature - Avatar
If an opponent would gain life, they lose that much life instead.
: Target creature gains flying and lifelink until end of turn.
3/4

{monger}Rise of Titans
Sorcery
Destroy all creatures with power less than target creature’s power.
"Before Her coming, the skies shall fall, the seas crash upon land, and the earth open up. The meek shall not be spared, but suffer tenfold."
—The Book of the Blessed

I like it much. Six CMC is perfectly fine for this effect. It reminds me of Fell the Mighty. It perfectly encapsulates 's selfishness and singular quest for power. High, high rating on this one.

{Flo00}Smogswimmer
Creature - Elemental
When Smogswimmer enters or leaves the battlefield, target player exiles the top seven cards of his or her library.
Evoke
6/4

The exile numbers might be a bit too much; five seems right to me. The FFL might tweak them some, unless WotC wants to make mill a viable deck in Modern. I am ok with that. Standard might have some issues. As a rare, draft could run into some problems. You won't see it as often, but be careful about the reanimation in the set.

{kinotherapy}Phantasmal Merlion
Creature - Cat Illusion
Phantasmal Merlion gets +1/+1 for each card in your hand.
Whenever Phantasmal Merlion becomes the target of a spell or ability, sacrifice it.
0/0

Simple, powerful, and easily goes poof. Could push Illusions more into Modern. It would often only be a 3/3 or 4/4 at most, though (before pumps), and fights with Krovokian Mists in the 2 drop slot. Aether Vial would be a bigger hit in the deck, though.

{Waffle}Lyo, Guardian of Temasek
Legendary Enchantment Creature - God
Indestructible
As long as your devotion to white and blue is less than six, Lyo isn't a creature.
Lyo, Guardian of Temasek gets +1/+1 for each creature you control.
: Create a 0/1 white Human Cleric creature token.
2/4

I added white to the token, as you forgot to put a color. It seems God's a popular creature type this week. This seems fine. I'm a bit iffy on devotion off Theros, as only that plane makes beliefs into reality (so far.)

{Akai Ryu}Abruptstorm
Creature - Elemental
Flash
Islandwalk
Evoke
When Abruptstorm enters the battlefield, counter target noncreature spell.
4/4

It could cost and be fine. I like the flavor of mixing the name and evoke; it's here and then gone and leaves chaos in its wake.

{bagz}Spirit of the Harbor
Legendary Enchantment - Aura
Flash, indestructible
Enchant Island
When Spirit of the Harbor enters the battlefield, return all attacking creatures to their owner's hand.
Whenever one or more creatures attack you, if you control no creatures, Spirit of the Harbor loses enchant Island and becomes a 0/5 Spirit creature with reach and "This creature can block up to two additional creatures." It's no longer an aura.
At the beginning of each end step, if Spirit of the Harbor is a creature, it becomes an aura enchantment with enchant Island. Attach it to an Island.

Sigh.

Spirit of the Harbor
Legendary Creature - Cat Spirit
Flash, flying
When Spirit of the Harbor enters the battlefield, return all attacking creatures to their owner's hand.
Spirit of the Harbor can block an additional creature each combat.
4/5

What most non-judge-minded people don't realize is the end of turn and type changing effects carry all sorts of issues. The way you originally worded it, it would stop being a creature and become an aura again enchanting nothing, then be put into the graveyard because it's not attached to anything. I'm not even sure I got the rewording correct since it's so complicated. I hope I got what you intended in that rewording. 

{Third place}
In third place we have gateways7! Again, a bit strong for an uncommon. The numbers on the card might need to be messed with, but the effect seems solid.

{Second place}
In second place, zuty! A perfectly playable, well designed card. Fills several niches in a set and might see some casual commander play. Thassa, God of the Sea budget replacement, maybe?

{First place}
And coming in first is monger! Yaaay! Love the card so much. It protects your finisher in control decks, gets rid of small utility creatures in Commander, and just is good. Well done!.