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The card can also easily lock your opponent out of keeping a flier on the battlefield if you flip Atzal, since it can trade with any flier when you return it to the battlefield and then it goes right back to your graveyard to do it again

This could cover that spot for extra threat coming from the sideboard

Bloodghast An oldie but a goodie

All that alone would make Sephara at least a bit interesting for Commander, but the alternative casting cost really pushes it to another level

If the creature this Aura is attached to leaves the battlefield or stops being a creature before the activated ability resolves, Wingspan Stride will be put into its owner's graveyard as a state-based action before that ability resolves, and it won't be returned to its owner's hand