Hightide Terror

Islandwalk, Trample
Hightide Terror's toughness is equal to the
number of cards in each player's graveyards.
Whenever Hightide Terror attacks, put the top
three cards of defending player's library into
their graveyard.
{2}{u}: Hightide Terror assigns combat damage
equal to its toughness rather than its power
until the end of the turn.