Does Mutate Have Summoning Sickness?

Do Mutated Creatures Have Summoning Sickness? No, Mutated Creatures are existing creatures that have mutated into something new. Because of this, newly Mutated Creatures don't suffer from summoning sickness.

Does mutate get summoning sickness?

This new creature gains all features of the top card and the ability text of all cards underneath (yes, you can mutate a single creature multiple times). It also gains all Auras, counters, and attached equipment of the targeted creature. It doesn't have summoning sickness, though, so swing away.

Does mutate count as entering the battlefield?

If I cast a creature spell for its mutate cost to mutate an existing creature on the battlefield, does that trigger “enter the battlefield” effects? No, the resolving mutating creature spell doesn't enter the battlefield. It simply makes the creature that was already on the battlefield change characteristics.