"Sandspout Sentinel"

Graft 6 (This creature enters the battlefield with
6 +1/+1 counters on it. Whenever another
creature enters the battlefield, if this creature has
a +1/+1 counter on it, you may move a +1/+1
counter from this creature onto that creature.)
Vigilance
Whenever a creature you control blocks, if it has
a +1/+1 counter on it, it deals damage equal to its
power to each opponent.