Scarfin, Predator of the Deep

Haste, Islandwalk, Shroud
Whenever another creature is dealt damage, put
a blood counter on it.
{t}, Remove X blood counters from a creature
with at least 1 blood counter on it; Scarfin gets
+X/+0 then deals damage equal to its power to
that creature. Then that creature deals damage to Scarfin equal to its power.