You must choose two legal targets in order to cast Aether Helix. If there are either no permanent cards in your graveyard or no permanents on the battlefield, you cannot begin to cast it.
2021-04-16 · Wizards of the Coast
If only one target is still legal as Aether Helix tries to resolve, it will still resolve and perform the appropriate action on the remaining target.
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Black Knight Games · Foil