Challenge Slots

Consult the Guidewall
Sorcery
Distribute X +1/+1 counters among any number of creatures you control, where X is the number of colors among cards in your graveyard.
"May the wisdom of our ancestors grant us strength."

The art would depict cavemen inspecting cave paintings.

Alright, will judge this in 24h, get your entries in!

Thanks for the win!
Coming up:

LIMIT #79: Get a life. No, really: your card must involve lifegain. (Thanks, jacqui-pup!)
LIMIT #23: Your card's color identity contains black.
New limit:
LIMIT #191: Over the river and through the woods, to grandmother's house we go~. Your card has a flavor derrived from "long distance journeys." (Thanks melono!)

EDIT:
Idea ZephyrPhantom
Look, just, just make something involving long distance travelling. I changed it already.

melono - I really like it though. Can I keep it as that? - ZephyrPhantom

You heard em, from marathon to horizon.

(Until melono says otherwise, at least, but OP has been updated.)

ZephyrPhantom - keep it how you want, but it does have to be clear that people are supposed to theme their card around travelling far. Is that not clear? Or is only the marathon to horizon unclear?

I just think it rolls off the tongue nicely haha. it seems entirely clear to me

I'll take out the quotes then in the OP.

Pharios' Final Sprint
Enchantment - Saga
(As this Saga enters and after your draw step, add a lore counter.)
I, II - Discard two cards, then draw two cards. You gain 5 life.
III - You lose life equal to your starting life total.

Reference to the origins of Marathon, where a Greek messenger ran 240 km to deliver a message to the assembly before dying. The card emulates Final Fortune and Chance for Glory type effects, with a white and black twist in that you're able to cheat the given terms if you're able to assemble sufficient lifegain.

Luxury Space Cruiser
Artifact - Vehicle
Flying, lifelink, menace
Crew 5 (Tap any number of creatures you control with total power 5 or greater: This Vehicle becomes an artifact creature until end of turn.)
Legendary crew 2 (Tap any number of legendary creatures you control with total power 2 or greater: This Vehicle becomes an artifact creature until end of turn.)
5/5

Can't get much larger distance than that.

Usually the part with "whenre X is ..." is in the same sentence the X is in. It's maily separated if X is a cost.
The lifegain could be "You gain 1 life for each 1 damage dealt this way." or "You gain X life."

About your signature: I'm not the expert here, but I think it should be "I will be glad to ..." or "I am glad to ..."/"I'm glad to ..."
And I think "advise" is the verb and "advice" the noun.

Bridge to Paradise
Enchantment
~ enters the battlefield with seven piety counters on it.
Whenever you attack or target an opponent or a permanent an opponent controls, remove a piety counter from ~.
If your life total would be reduced to 0 or less, instead exile ~ and gain life equal to the number of piety counters on ~ before reducing your life total. At the beginning of your next upkeep, you win the game.

Judging the challenges! Everyone made a really nice card, let me just say that. But only one may stand.



Idea - Overbook Fare: A nice pillow fort piece. Especially strong for opposing going-wide strategies. If the opponent has only 1 power creatures they’re boned, though that is very rare. One thing I’m not entirely sure about, is the additional paying of life allowing for that wording of gaining life. But it’s obvious to me what it’s supposed to do, so it’s fine.



ZephyrPhantom - Pharios’ Final Sprint: Damn, that’s a funny card. And indeed fitting for the myth of the first marathon. Totally great in gifting strategies (though it is outside of Zedruu’s colors.)



Daij_Djan - Prepare for the Odyssey: A quite standard sac something draw two as black often has at common. It’s probably not too complex for common, though the tokens might have to be explained if it’s supposed to be a common. The most fun part about this card is of course sacrificing a single artifact creature, which gives so much value with this (which does slightly add to its complexity to use though). Though without the perfect sac target, it is still more than good enough to see some play, at minimum in draft.



Flo00 - Luxury Space Cruiser: A cruise for celebrities who want to hang back and let this big boy attack in their stead. I don’t really feel the black in the flavour except maybe for the space-theme. Mechanically, yes, those are all black keywords. Legendary crew is a nice alternative to something like legendary equip. Especially in commander, of course. I would’ve liked to see a flavour text line about carrying legendaries though. And/or maybe calling it a Luxury STAR Cruiser instead, as it travels to stars, for those legendary stars.



twintania - Round-the-world Vampiric Tour: Feels like a silly card due to the name and picture, but its effect can actually be quite solid. Its cost might be too high, but that would be something to find out in gameplay tests. You need many lands to really get this up to speed after all, so it being a smaller amount of mana wouldn’t make it OP immediately.



moweda - Aether Corruption: Searching for any land card and putting it on the battlefield is very powerful. Just like how Crop Rotation is pretty darn powerful. This card sticks around, doesn’t sac a land, can be blinked, and has an additional effect to boot. It does cost more, but I don’t know if that’s enough. Especially because the additional effect is a drain-and-gain every single turn. Also seeing how this can stack, just making a deck around that effect wouldn’t be the strangest… Which, might be a good thing? It’s an odd and powerful one, but that’s not a bad thing per se.



vizionarius - Bridge to Paradise: This… is too easy of a win condition to be on a 4-mana card. There are after all so many ways to lose life without relying on your opponent, or targeting/attacking, that as soon as this hits, you should immediately lose all your life, and then win the next upkeep. And as it’s an instead to loss of life, which can be lost as a cost, it’s not really counterable. Some examples for cards that make this busted by the way are, to only name some low-mana ones: Blood Celebrant, Adanto Vanguard, Hibernation Sliver, Necropotence, and the list goes on and on…



The winner is...