Create A Magic: The Gathering Card

[Substituted Existence]

Kerenko, Master of the Horde. converted manacost (6) (4 colorless, 2 red)

Planewalker - Krenko

base loyalty 0

+0: Krenko enters the battlefield with x loyalty counters where x is the number of goblins in play.

-3: put a 1/1 red goblin token in play for each other goblin on the battlefield

-10: you get an emblem that says: at the beginning of your next upkeep, sacrifice all goblins you control, Krenko, Master of the horde deals 2 damage to target opponent for each goblin sacrificed this way.

[Diosu]

Substituted Existence

Kerenko, Master of the Horde. converted manacost (6) (4 colorless, 2 red)

Planewalker - Krenko

base loyalty 0

+0: Krenko enters the battlefield with x loyalty counters where x is the number of goblins in play.

-3: put a 1/1 red goblin token in play for each other goblin on the battlefield

-10: you get an emblem that says: at the beginning of your next upkeep, sacrifice all goblins you control, Krenko, Master of the horde deals 2 damage to target opponent for each goblin sacrificed this way.

This doesn't work since it would die due to state based effects after it resolved. You wouldn't be able to use his first ability before he died. I would at least make his loyalty 4 and then have his +0 add a loyalty counter for each goblin you control. For six mana he has to be pretty good, think Elspeth.