The Golden Game

Glorious Heritage
Legendary Enchantment - Background
Commander creatures you own have "Whenever this creature attacks a player, untap all other attacking creatures you control. They get +1/+1 until end of turn."
: Exile ~, then return it to the battlefield transformed tapped and attacking. Activate only if you control five or more attacking creatures and only before blockers are declared.
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Fulfillment of Prophecy
 Legendary Enchantment Creature - Avatar
Whenever an attacking creature you control dies, untap all attacking creatures you control and put a +1/+1 counter on each of them.
~'s power is equal to twice the number of attacking creatures you control.
"The bloodline of legends personified brings victory to battle."
*/5

Kerlinn's Underworld Escape
Legendary Sorcery
(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
Choose one –
• ~ deals 2 damage to each creature and planeswalker.
• Whenever a creature dies this turn, draw a card.
If you cast ~ from exile, put it onto the battlefield transformed.
Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)
~ can be your commander.
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Kerlinn the Obliterator
Legendary Creature - Demon Warrior
Haste, first strike
Boast – : Destroy each creature and planeswalker that has been dealt damage this turn. (Activate only if this creature attacked this turn and only once each turn.)
4/3

Maybe this is a bit too much in terms of different mechanics mixed together? On the other hand what you asked for is also a bit much to adhere to.

Thanks for the win!!

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Next: Design a sorcery that has black and at least one other color in its cost.

Destroy the Evidence
Sorcery
As an additional cost to cast ~, sacrifice a clue.
Choose one:
- Destroy target creature.
- Gain control of target noncreature artifact. Untap it.
"Fraud, theft, murder? The pigs will never know."

Also, yes, this name is already in use. But that card is very meh imo, so I don't feel bad about reusing this name. Alternative title would be Tamper with the Evidence.

Feedback

melono: If you didn't point out that there is already a card with that name, I wouldn't have known. I think the additional cost of sac'ing a Clue is too prohibitive. People don't usually have Clues just lying around, so the card will very often be uncastable. Giving it an escalate cost of sac'ing a Clue would be better, allowing the choice to do both. Killing a creature at instant speed is already available as a common at , so at sorcery speed at uncommon with an added choice and effect for a deck designed to make use of both sides I think is totally fine. I like the effects.

viriss: Unfortunately this is an instant, and the prompt asked for a sorcery (I just noticed this, would have pointed out sooner, sorry!). It feels like a really strong card for a common. Makes blocking extremely effective (essentially giving +2/+2 to blockers but also straight-up killing a horde of X/1s). The closest card I think is Zealous Persecution. The effect moved to combat definitely makes it feel a lot more green. I like it, just might have added an extra to the cost, or made it uncommon.

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Result

melono wins for the only entry that's a sorcery, though I do like viriss' card a little more due to the hard-to-cast nature of melono's design.

Though the mouse is great value, I really like the sort-of goofiness of the turtle-animorph.

vizionarius wins!

I know this is a very specific ability, but for reference, I'm making a 60 card deck based around a bee theme, so there's lots of Insect and Plant and Food tokens.

Coral Excavation
Sorcery
Draw two cards, then mill two.
Flashback - Pay 2 life, discard two cards, (You may cast this card from your graveyard for its flashback cost. Then exile it.)
"Come on men! Scrape deeper!"

Tyftw!

Next: Create a common card with a minimum of three color identities, but a maximum of one color in its mana cost.

All are pretty neat, and I could see being printed.
The one hybrid for an effect are both pretty well done by viriss and Flo00 with proper balance (could be even a tickle more powerful) from what I see. But I gotta give it to Daij_Djan for a card that really shows how the combo red+white is also available in black.
Winner: Daij_Djan

Ehmm...


I'll do this one from the commander game

It's my first time participating in something like that. So excited!