Diana, Careworn Tactician

At the beginning of each combat, creatures you control gain flying until end of turn as long as a creature with flying is on the battlefield or in a graveyard. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.
Sacrifice two other creatures: Diana gains your choice of first strike, deathtouch, or trample until the end of the turn.