Flood Corvette

{1}{b}{g}: Put a crash counter on Flood Corvette or remove a crash counter from it.
When Flood Corvette has three or more crash counters on it on your endstep, sacrifice it. If you
do, destroy target land and return target creature
from the graveyard to the battlefield with
converted mana cost X, where X is the amount
of crash counters on Flood Corvette.