Elder Deep-Fiend

13/07/16

A “when you cast” triggered ability resolves before the original spell resolves. It resolves even if the original spell is countered, and the original spell resolves even if the triggered ability is countered.

13/07/16

A creature’s converted mana cost is determined solely by the mana symbols printed in its upper right corner (unless that creature is the back face of a double-faced card, is a melded permanent, or is copying something else; see below). If the mana cost includes , X is considered to be 0. If it’s a single-faced card with no mana symbols in its upper right corner (because it’s an animated land, for example), its converted mana cost is 0. Ignore any alternative costs or additional costs (such as kicker) that were paid as the creature was cast.

13/07/16

If you sacrifice a creature with in its mana cost, that X is considered to be 0.

13/07/16

Once you begin to cast a spell with emerge, no player may take actions until you’re done. Notably, opponents can’t try to remove the creature you wish to sacrifice.

13/07/16

The converted mana cost of a creature spell with emerge isn’t affected by whether its emerge cost is paid. For example, if you cast Elder Deep-Fiend for its emerge cost and sacrifice a creature whose converted mana cost is 3, Elder Deep-Fiend’s converted mana cost remains 8.

13/07/16

You may sacrifice a creature with a converted mana cost 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.