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Flying
When Spectral Arcanist enters the battlefield, you may cast an instant or sorcery spell with mana value less than or equal to the number of Spirits you control from a graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead.
If you cast a spell with X in its mana cost this way, you must choose 0 as the value for X.
If you cast a spell without paying its mana cost, you may choose to pay additional costs (such as kicker) but not alternative costs (such as flashback).
If you choose to cast the spell, you must do so as Spectral Arcanist's ability is resolving. You can't wait and cast it later.
