Malakaar, The End of Life

Indestructible, Flying, Menace, Deathtouch
Anhialator 3
Whenever this creature attacks, Deal X damage to
any target where X is the number
of lands you control, then sacrifice a land.
Pay X life: Return X lands from your graveyard
to the battlefield tapped.
Whenever you cast a red or black spell,
Gain life equal to its converted mana cost.
Even Nicol Bolas trembled as the great
destroyer arrived.