Vovu, Blind Warrior

Defender, First strike
Whenever an opponent casts a spell for the first
time on their turn, put a +1/+1 counter on
Vovu, Blind Warrior.
Vovu, Blind Warrior can block an additional
creature for each +1/+1 counter he has. After
combat, remove one +1/+1 counter for each
creature Vovu, Blind Warrior blocked.