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No. Turning a face-down morph creature face up does not give it summoning sickness, and it does not reset how long you have controlled it. What matters is whether you have controlled the permanent continuously since the start of your most recent turn. If you have, the creature can attack after it is turned face up, provided nothing else stops it. If you cast it this turn, it generally cannot attack this turn unless it has haste.
What “summoning sickness” actually means
“Summoning sickness” is player shorthand for a rule that stops a creature from attacking, and from using abilities with the {T} or {Q} symbol in their cost, unless its controller has controlled it continuously since the beginning of their most recent turn. Haste is the familiar exception. The official rules describe the restriction in those terms, so the label itself is never the thing that decides a ruling. The question is always about control.
Why turning a morph face up doesn’t change the answer
Wizards of the Coast treats a face-down morph as a creature in every way. It is already on the battlefield, it can block, and it can attack once the rules allow. Turning it face up changes its characteristics, such as its name, mana cost, power, toughness, and abilities. It does not make a new permanent, and it does not make the creature enter the battlefield a second time.
That is why the face-up flip is irrelevant to attack eligibility. The clock that matters started when you gained control of the permanent, not when its face was revealed. Two details follow from this:
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- Turning a morph face up is a special action. It does not use the stack, so no player can respond to it.
- The flip does not tap or untap the creature. A tapped morph stays tapped when it turns face up, and an untapped one stays untapped.
Attack eligibility by scenario
The table below covers the ordinary case: a morph creature with no haste and no effect that alters control or attacking.
| Situation | Controlled continuously since your turn began? | Can attack this turn? |
|---|---|---|
| Cast face down on an earlier turn, turned face up this turn | Yes | Yes, if untapped and not otherwise restricted |
| Cast face down this turn, turned face up this turn | No | No, unless the creature has haste |
| Cast face down this turn, turned face up on a later turn | Yes, from your next turn onward | Yes, from your next turn onward |
| Gained control of a face-down creature this turn, then turned it face up | No | No, unless the creature has haste |
Morph cast this turn
Casting a morph creature face down costs its morph cost, usually {3}, and the creature enters as a 2/2 with no abilities. Turning it face up during the same turn does not help it attack. Its face-down form and its face-up form share the same control history, and that history started this turn. Unless it has haste, it can block on your opponent’s turn but cannot attack on yours until it has been under your control since the start of a later turn.
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Morph cast on an earlier turn
If you cast the creature face down on a previous turn, it has been under your control since the beginning of this turn. Turning it face up now does not change that. The creature can attack, and it can also use any {T} abilities it gains from its face-up characteristics, because those abilities are subject to the same control rule.
Stolen or gained morphs
If an effect gives you control of a face-down creature during your turn, the same rule applies. Control gained this turn is not continuous since the turn began, so the creature cannot attack that turn without haste. Turning it face up does not reset or extend the clock.
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Exceptions and limits
Haste and other effects can change the result. A card that grants haste lets a newly controlled creature attack that turn. Some effects also alter when or whether a creature can attack, regardless of how long you have controlled it. These effects are printed on specific cards, so check the card text rather than assuming a general rule covers it.
The explanation here follows Wizards’ published mechanics articles and the general control rule in its rules framework. For a tournament dispute, check the current Comprehensive Rules, which Wizards publishes on its rules pages, and confirm the numbering there, since rule numbers can change between updates.
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Quick checklist
- Did you control the permanent continuously since the start of this turn? If yes, it can attack.
- Did you gain control of it this turn? If yes, it cannot attack this turn unless it has haste.
- Turning a morph face up does not change either answer.
The short version: the face-up flip is a change of characteristics, not a new arrival. Whether a morph can attack depends only on when you gained control of it.
Quick Recap
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