Goliath

Trample.
Goliath's power and toughness are equal to the
number of lands you control.
If Goliath is sent to the graveyard from the battlefield, exile it instead, then return it to the battlefield transformed under its owner's control.
"Juuust geeet on wiiith it - rak," Goliath groaned as it plucked the silver key from its necklace.