What it does
"Ultimate Sacrifice" isn't an official Magic: The Gathering keyword or ability—you won't find it in the comprehensive rules or on any card. It sounds like a flavorful made-up term, possibly confused with actual mechanics like sacrifice (paying a permanent as a cost) or the casual notion of "going all-in" with a big sacrifice effect.
If you're thinking of real mechanics, "sacrifice" means moving your own permanent to the graveyard as a cost or effect—you choose what's sacrificed, and it can't be prevented or redirected like destruction can. Cards like Grave Pact or Dictate of Erebos force opponents to sacrifice, which is brutal in multiplayer Commander since each opponent loses creatures off a single death trigger.
If you saw "Ultimate Sacrifice" on a specific card or in a particular context, double-check the exact wording—it may be a fan-made card, a typo, or a casual nickname rather than official terminology.
Iconic cards with Ultimate Sacrifice
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