Soul of Asorath

At the beginning of combat on your turn, if you
control a creature with flying creatures you
control gains flying. the same is true for
firststrike, trample, haste, hexproof, deathtouch
and vigilance.
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"On the plane of Asorath, war is everything, either
you are the conquerer or the conquered."
— Tome of Ancient Wars, Verse 2295