Manta Ray can't attack unless defending player controls an Island. Manta Ray can't be blocked except by blue creatures. When you control no Islands, sacrifice Manta Ray.
Whenever Bone Dancer attacks and isn't blocked, you may put the top creature card of defending player's graveyard onto the battlefield under your control. If you do, Bone Dancer assigns no combat damage this turn.
Flying You may discard Circling Vultures any time you could cast an instant. At the beginning of your upkeep, sacrifice Circling Vultures unless you exile the top creature card of your graveyard.
You may exile the top three black cards of your graveyard rather than pay this spell's mana cost. Spinning Darkness deals 3 damage to target nonblack creature. You gain 3 life.