The creature chosen to be sacrificed is still on the battlefield as the cost of the emerge spell is determined and as you activate mana abilities to cast the emerge spell. Its abilities may affect the spell’s cost, be activated to generate mana, and so on. However, if it has an ability that triggers when a spell is cast, it will have been sacrificed before that ability can trigger.
Elder Deep-Fiend
You may sacrifice a creature with a mana value of 0, such as a token creature that’s not a copy of another permanent, to cast a spell for its emerge cost. You’ll just pay the full emerge cost with no reduction.
If you sacrifice a creature with {X} in its mana cost, that X is 0.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Jason Felix
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
