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Set: Silver Tempest

Along with that, it has a tap ability that reads: Spells you cast this turn that are black and/or red cost X less to cast, where X is the amount of life you lost this turn

More recent skeletons have seen this replaced with a similar theme: Either the new wording of regenerate found on cards like Drudge Sentinel, or the ability to easily return from the graveyard like Reassembling Skeleton

Seeing as Summons in the actual Final Fantasy franchise only stick around for a few turns, having them represented as Sagas in Magic makes perfect sense

You can obtain the Zebstrika (2-Diamonds rarity) card by opening Mega Rising: Mega Blaziken from Mega Rising set