Evolving Generation
Enchantment -

{G}
When ~this~ comes into play, remove all creatures you own from the game. Then put a Green 2/2 Creature, that counts as a Mutation, into play for each creature removed from the game this way.
During your upkeep, you may pay

{X}. If you do, remove X Mutations from the game. Then put X green X/X Creatures, that counts as Mutations, into play.
Current Version: Evolving Generation
Enchantment -

{G}
When ~this~ comes into play, remove all creatures you own from the game. Then put a Green 2/2 Creature, that counts as a Mutation, into play for each creature removed from the game this way.
During your upkeep, you may pay

{X}. If you do, remove X Mutations from the game. Then put X green X/X Creatures, that counts as Mutations, into play.
It costs you the creatures, but replaces them with growable creatures, that even can be changed as you want. It is a fun cookie card, and I can already see bunches of combos with this card.