Drevlin Tactician

{u}{r}{t}: Sacrifice a creature, Scry 2, then reveal the top card of your library. If it is an instant or sorcery, you may draw 2 cards.
Whenever you cast an instant or sorcery, you may switch Drevlin Tactician's power and toughness until the end of turn.
The sirens of Drevlin put very little value on life... besides their own, of course.