Reprinted 5x historically, most recently in 2020 -- no dedicated reprint sets or recent activity.
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Death's Oasis
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Oracle Data
, Sacrifice this enchantment: You gain life equal to the greatest mana value among creatures you control.
Official Judge Precedents
Because the triggered ability doesn't target the creature card in your graveyard, you may choose one of the two cards you put there from your library.
Use the mana value of the creature as it last existed on the battlefield and the mana value of the creature card as it exists in your graveyard to determine which cards may be returned to your hand. This may result in a creature's death bringing itself back to your hand; perhaps it was one card of a merged creature, or it had become a copy of a more expensive creature.
If Death's Oasis becomes a creature, activating its last ability will cause its first ability to trigger.
If a creature on the battlefield or a card in your graveyard has 
in its mana cost, X is considered to be 0.
