Greven, Predator Captain

This land enters tapped. T: Add U or R.

When this creature is turned face up, counter all abilities your opponents control. Megamorph 1U (You may cast this card face down as a 2/2 creature for 3. Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)

This land enters tapped. When this land enters, you may put target creature card from your graveyard on top of your library. T: Add B.

Creatures can't attack you unless their controller pays 2 for each creature they control that's attacking you.

Draw three cards.

Exile the top three cards of your library. Until the end of your next turn, you may play those cards. If this spell was cast from a graveyard, you may play cards this way without paying their mana costs. Flashback 7R (You may cast this card from your graveyard for its flashback cost. Then exile it.)

(T: Add R.)

T: Add CC.