Invasion of Muraganda // Primordial Plasm

Set name - March of the Machine
(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)
When this Siege enters, put a +1/+1 counter on target creature you control. Then that creature fights up to one target creature you don't control.

At the beginning of combat on your turn, another target creature gets +2/+2 and loses all abilities until end of turn.

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Before the tree of life branched into predators and prey, there was only shapeless hunger.