iChamber

iChamber enters the battlefield with X i counters on it.

Whenever a player casts a spell, put an i counter on iChamber.

Whenever a non-i creature enters the battlefield, put an i counter on iChamber.

{3}: Create an X/X i creature token, where X is the number of i counters on iChamber as this ability resolves.

Sacrifice 13 i creature tokens, target player loses the game.