Once and Future

Instant    (CMC:4)

Return target card from your graveyard to your hand. Put up to one other target card from your graveyard on top of your library. Exile Once and Future. Adamant — If at least three green mana was spent to cast this spell, instead return those cards to your hand and exile Once and Future.

168 ELD • ENNils Hamm

™ & © 1993— Wizards of the Coast

Notes: TODO: Update Copyright

Not legal in any format.

Oracle Text (click to copy):

Once and Future {3}{G} Instant Return target card from your graveyard to your hand. Put up to one other target card from your graveyard on top of your library. Exile Once and Future. Adamant — If at least three green mana was spent to cast this spell, instead return those cards to your hand and exile Once and Future.

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View this MTG card on Gatherer

10/4/2019
You choose which card will be returned to your hand and which will be put on top of your library as you choose those cards as targets, not as Once and Future resolves.
10/4/2019
If one of the two target cards is an illegal target by the time Once and Future resolves, you’ll put the other in the appropriate zone and exile Once and Future. If both targets are illegal, the spell won’t resolve and you won’t exile Once and Future.
10/4/2019
If an instant or sorcery spell has an adamant ability, you perform the spell’s instructions in order. You don’t perform the adamant instruction before the spell resolves or before any other effects printed above it.
10/4/2019
If an effect allows you to cast a spell without paying its mana cost, you can’t choose to cast it and pay unless another rule or effect allows you to cast that spell for a cost. Similarly, you can’t waive a cost reduction unless that effect says you may.
10/4/2019
Adamant effects check what mana was actually spent to cast a spell. If an effect allows you to spend mana “as though it were mana” of any color or type, that allows you to spend mana you couldn’t otherwise spend, but it doesn’t change what mana you spent to cast the spell.
10/4/2019
If you copy a spell that has an adamant ability, no mana was spent to cast the copy at all, so that ability won’t apply.

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Card Once and Future is not on TCGPlayer.