Marian, Selfish Protector

Convoke

Double strike, menace, ward {x}, where X is the number
of nontoken creatures you control.

Other creatures you control get -1/-1.

Whenever you lose one or more life, put a +1/+1 counter
on Marian.

{b}, Sacrifice another creature: Marian gains deathtouch and lifelink until end of turn, it then regenerates.