Rot-Cleansed Giant

Rot-Cleansed Giant enters the battlefield with a +1/+1 counter on it for each card in target player's graveyard.
If damage would be dealt to Rot-Cleansed Giant, prevent that damage, remove that many +1/+1 counters from Rot-Cleansed Giant, and create that many 1/1 Skeleton creature tokens.
Sacrifice three Skeletons: Put a +1/+1 counter on Rot-Cleansed Giant.