Purple Dust

{t}: Add {u} or {r} to your mana pool.
{1}{u}{r}, {t}, Sacrifice Purple Dust:
Choose two.
-Target creature gains flying until end of turn.
-Target creature loses flying until end of turn.
-Target creature blocks another target creature this turn if able.
-Target creature can't block this turn.
"Extremely heavy. Bounces surprisingly well."