Abathur, Evolution Master

Other Zerg creatures have vigilance as long as
Abathur remains on the battlefield.
Whenever you place +1/+1 counters flip a coin.
If the coin lands on heads double the amount
of +1/+1 counters you place.
"Look at the flesh, see only potential. Strands,
sequences, twisting, seperating, joining. See how it
could be better. Eat flesh, splinter bone. Inside me,
can touch it. Weave it. Spin it. Make it great."
—Abathur, Evolution Master