Althaea, Fallen Queen

Flying, Lifelink, Double Strike
Whenever Althaea enters the battlefield, create
two 0/1 black Imp creature tokens with flying.
Whenever an Imp you control dies, Althaea gets
+1/+1 until end of turn.
At the beginning of your end step, if 30 or more
Imps you control died this turn, gain control of
target creature an opponent controls.