Autumn, Essense Trickster

{3}{w/u}, {t}: If your opponents control creatures with flying, they lose flying until Autumn, Essence Trickster becomes untapped. The same is true for for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance. Creatures you control have the abilities lost by your opponents creatures this way.
You may choose not to untap Autumn, Essence Trickster during your upkeep.