Impa, Sage of Shadow

+1: Put a shadow counter on target creature you control. You can cast creatures you own with shadow counters from your graveyard or exile.
-X: Surveil 1. You can cast an instant or sorcery from your graveyard with converted mana cost X or less without paying its mana cost, then exile it.
-6: You get an emblem that says "Whenever a creature would die, its owner can pay life equal to its power. If they don't, exile it instead."