Gargantuan Leviathan

Double Strike, Reach, Indestructible
Gargantuan Leviathan gains +X/+0 , where
X is the amount of Leviathans in your graveyard

The Gargantuan Leviathan adult is roughly 5 kilometers (or about 3 miles) in length. Due to
its enormous size, it can only be found in the
Dead Zone abyss. -PDA Entry