Cliff of the river

Cliff of the river enters the battlefield tapped unless you control a island mountain. You may
put the top card of your library into your graveyard instead of having a island mountain.
{t}: Add {u} or {r}
{6} Cliff of the river turns into a 5/8 blue and
red djinn with flying, haste, hexproof and
menace until end of the turn.