What it does
Emerge is an alternative cost that lets you cast a creature spell by sacrificing another creature, reducing the spell's generic mana cost by the sacrificed creature's mana value. You still pay any colored mana in the emerge cost, but the sacrificed creature shaves off generic mana equal to its mana value.
The big nuance: you sacrifice the creature as part of casting the spell (while putting it on the stack), not when it resolves. This means abilities that trigger on the emerge creature dying go on the stack along with the spell—and the cost reduction uses the sacrificed creature's mana value, not its power or toughness. Also, emerge is optional; you can always just hard-cast the creature normally.
In Commander, emerge shines with tokens or expendable creatures, turning a chump into a discount while triggering death/sacrifice synergies. Eldritch Moon's Eldrazi like Elder Deep-Fiend are classic payoffs.
Iconic cards with Emerge
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