Like most Magic: The Gathering cards, the value of Fate Unraveler depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Commander 2015)
1 foil card of random rarity with premium finish
But we almost never see it put to use in Old School
Level One, "Strategies" Turn One : Shock (18) Turn Two : Ash Zealot, attack (16) Turn Three : Toil & Trouble for 7 (9), attack with Ash Zealot (7) Turn Four : Attack with Ash Zealot (5), Boros Charm (1), Skullcrack [for good measure] (-2) A Red-White Burn deck, la Watanabe's Beijing semifinals and finals opponents, could theoretically end games of Magic fairly quickly
Mewtwo from the Sword & Shield era, however, has 69.2% more HP than regular Mewtwo, and Mewtwo from the Scarlet & Violet era has 76.9% more HP
Its abilities may affect the spell's cost, be activated to generate mana, and so on