Seafloor Gargant

{x}{g/u}{g/u}: Adapt X. (If this creature has no
+1/+1 counters on it, put X +1+1 counters on it.
As long as Seafloor Gargant has power 5 or greater, it has trample and "Whenever this creature becomes the target of a spell or ability, draw a card." (This creature can deal excess combat damage to the player or planeswalker it's attacking.)