Fossa di Catrame Strisciante
Creeping Tar Pit
Zendikar Rising Expeditions
Mythic
Land 
Creeping Tar Pit enters the battlefield tapped.
{T}: Add {U} or {B}.
{1}{U}{B}: Creeping Tar Pit becomes a 3/2 blue and black Elemental creature until end of turn and can't be blocked this turn. It's still a land.