Shapechanger. The mimic can use its action to polymorph into a cake or back into its true, amorphous form. Its statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

Adhesive. The mimic adheres to anything that touches it. A Medium or smaller creature adhered to the mimic is also grappled by it (escape DC 11). Ability checks made to escape this grapple have disadvantage.

False Appearance (Object Form Only). While the mimic remains motionless, it is indistinguishable from an ordinary, inanimate cake.

Grappler. The mimic has advantage on attack rolls against any creature grappled by it.

Holiday Spirit. If damage reduces the mimic to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is from a critical hit. On a success, the mimic drops to 1 hit point instead.

Pseudopod. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3 (1d4 + 1) bludgeoning damage. If the mimic is in object form, the target is subjected to its Adhesive trait.

Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3 (1d4 + 1) piercing damage plus 2 (1d4) acid damage.

Eye Rays. As a bonus action, the mimic shoots three of the following multicolored rays of light from its eyes at random, choosing one to three targets it can see within 60 feet of it.  Each ray is a different color and has a different power and purpose.  For each target, roll a d8 (rerolling duplicates) to determine which color ray affects it.

1. Red. The targeted creature must succeed on a DC 10 Strength saving throw or be restrained by magical force for 1 minute.  The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

2. Yellow. The targeted creature must succeed on a DC 10 Dexterity saving throw or fall prone.

3. Green. The targeted creature must succeed on a DC 10 Constitution saving throw or be poisoned for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

4. Blue. The targeted creature must succeed on a DC 10 Intelligence saving throw or become frightened of the mimic for 1 minute.  The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

5. Purple. The targeted creature must succeed on a DC 10 Wisdom saving throw or fall unconscious for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.  The target also awakens if it takes damage or another creature takes an action to wake it.  This ray has no effect on constructs and undead.

6. Pink. The targeted creature must succeed on a DC 10 Charisma saving throw or be charmed by the mimic for 1 minute, or until the mimic harms the creature.  The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.