Board & Card Games Stack Exchange is a question and answer site for people who like playing board games, designing board games or modifying the rules of existing board games. It only takes a minute to sign up.
Sign up to join this community
If a player manifests a creature card with the morph ability, can that player pay the morph cost to turn it face up?
For example, if Anthony casts Formless Nurturing to manifest Abomination of Gudul, can he pay the morph cost of {2}{B}{G}{U} instead of the creature cost of {3}{B}{G}{U} to turn it face up?
Yes. If a creature card with Morph is manifested, the permanent it becomes may be flipped for either its creature cost or its morph cost. This is covered by the following rule introduced in Fate Reforged:
701.31c If a card with morph is manifested, its controller may use the procedure described in rule 702.36d to turn a face-down permanent with morph face up rather than the procedure described above to turn a manifested permanent face up.
In your specific example, Anthony may choose to pay either {2}{B}{G}{U} or {3}{B}{G}{U} to flip Abomination of Gudul at any time he has priority.
For reference:
702.36d Any time you have priority, you may turn a face-down permanent you control face up. This is a special action; it doesn’t use the stack (see rule 115). To do this, show all players what the permanent’s morph cost would be if it were face up, pay that cost, then turn the permanent face up.
You can pay either the morph cost or the creature's normal mana cost to flip it up.
Manifest is covered in Mechanics of Fate Reforged. The relevant snippet for this question:
If you happen to manifest a card with morph, you can turn it face up either by paying its mana cost (if it's a creature card) or by paying its morph cost.
In general, when you have a question about a mechanic from a new set, a really good place to find answers about it is the mechanics article Wizards posts for the set. The title is always in the same form as this article ("Mechanics of {set name}") so they're really easy to search for.
If you want the full technical details, the comprehensive rules are the place to go (see Rainbolt's answer), but if you want a practical, easy to understand answer, these articles are really useful. As a bonus, they're often published a bit before the comprehensive rules updates, so you can satisfy your curiosity sooner.
