Invasion of Muraganda

(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 Invasion of Muraganda enters the battlefield, put a +1/+1 counter on target creature you control. Then that creature fights up to one target creature you don't control.

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

Primordial Plasm

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

Invasion of Muraganda // Primordial Plasm

(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 Invasion of Muraganda enters the battlefield, 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.

Invasion of Muraganda // Primordial Plasm

Battle — Siege // Creature — Ooze