Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.),
haste (This creature can attack,
and
as soon as it comes under your control.)
Whenever Froghemoth deals combat damage to a player, exile up to that many target cards from their graveyard. Put a +1/+1 counter on Froghemoth for each creature card exiled this way. You gain 1 life for each noncreature card exiled this way.