Alstreim, Seeking for help

Banding, haste
When Alstreim, Seeking for help, forms a band,
if a creature in the band has flying, every creature
in the band gains flying until end of turn.
The same is true for first strike, double strike,
deathtouch, reach, hexproof, indestructible,
lifelink, protection, landwalk, and trample.