Otherworld Golem

Swampwalk (This creature can't be blocked as long
as defending player controls a swamp.)
Whenever Otherworld Golem deals combat
damage to a player, that player exiles three cards
from their graveyard. If one or more of them
were lands, Otherworld Golem gets +1/+1 for
every land exiled this way until end of turn.
Its roars speak of riches hidden in the Otherworld and
the souls lost attempting to get them.