Not only does this give you more play options by allowing more to happen at instant speed (upgrading Mantle of Webs to Sudden Spinnerets, for example), it lets you customize creatures like Grimdancer and Helica Glider to your needs by choosing their abilities as they enter the battlefield
They mutate into the creature on top plus all abilities from under it.) Whenever this creature mutates, other creatures you control get +X/+X until end of turn, where X is the number of times this creature has mutated
In terms of raw power, I dont think Izoni is game-breaking
9 Zekrom ex: Black Bolt (Black White Rare) $237.39 Black Bolt's Zekrom ex claims a slim lead over the equivalent Reshiram from White Flare, signaling the battle between these two cards is far from over
Q: What is the time limit for each Round for the Remote Duel Quarter Century Stampede Release Celebration
Repeat it next turn to mill another opponent