Manifest

Manifest is a keyword action introduced in Fate Reforged. When you manifest a card, you put it onto the battlefield face down.

Description
Flavorwise, manifest represents Ugin's draconic magic from Tarkir's past, rooted in concealment and deception. It was designed to feel like a proto-morph mechanic.

While face down, a manifested card is a 2/2 colorless creature with no name, no abilities, and no creature types.

A manifested creature card may be turned face up for its mana cost. A manifested noncreature card can't be turned face up this way.

After Fate Reforged, Manifest was featured in Commander 2018, Modern Horizons and Commander 2019.

Rulings

 * You may put an overlay card on a manifested creature while it's on the battlefield. The overlay is just a reminder. You don't have to use it if you don't want to, and it doesn't change how face-down creatures function.
 * Any time you have priority, you can turn a manifested creature face up if it's a creature card. You do this by revealing what its mana cost is and paying that cost.
 * As soon as the card is face up, it has its normal characteristics.
 * If you manifest a noncreature card, it can't be turned face up this way.
 * 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.
 * Turning a face-down creature face up doesn't use the stack and can't be responded to.
 * If the face-down creature has any counters on it, those remain on the face-up creature. It's not a new creature, and it doesn't enter the battlefield just by turning face up. Any Auras or Equipment attached to the manifested creature remain attached to it after it turns face up.
 * A few older cards turn a face-down creature face up. If you manifest an instant or sorcery card, and one of these older cards tries to turn it face up, reveal the card and it stays on the battlefield face down.
 * The rules for double-faced cards were changed slightly to account for the possibility that they are manifested. If a double-faced card is manifested, it will be put onto the battlefield face down. While face down, it can't transform. If the front face of the card is a creature card, you can turn it face up by paying its mana cost. If you do, its front face will be up. A double-faced card on the battlefield still can't be turned face down.

Card that interacts with manifested cards

 * Qarsi Deceiver