Thunderous Orator

Vigilance
Whenever this creature attacks, it gains flying until end of turn if you control a creature with flying. The same is true for first strike, double strike, deathtouch, indestructible, lifelink, menace, and trample.

The List

Strixhaven: School of Mages

Check the creatures you control as the triggered ability resolves to determine which abilities Thunderous Orator gains. Once Thunderous Orator gains an ability, it doesn’t matter what happens to other creatures you control with that ability.

If you control a creature with one of the abilities listed in the last sentence, Thunderous Orator will gain the that ability, not flying.