Shapechanger. The mimic can use its action to polymorph into a wand 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 (Object Form Only). The mimic adheres to anything that touches it. A Large or smaller creature adhered to the mimic is also grappled by it (escape DC 13). Ability checks made to escape this grapple have disadvantage.

Charged Spellcasting. The mimic's innate spellcasting ability is Wisdom (spell save DC 15). The mimic has 7 charges that it can expend to cast spells.  The mimic does not need to concentrate on concentration spells and can innately cast the following spells, requiring no material components:

5th–9th level (7 charges): animate objects (1 charge, 5th-level spell), true polymorph (2 charges, turns target into mimic)

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

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

Mimic Telepathy. The mimic can magically command any mimic within 120 feet of it, using a limited telepathy.

Multiattack. The mimic makes two melee weapon attacks.

Pseudopod. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) bludgeoning damage. If the mimic is in object form, the target is subjected to its Adhesive trait.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature grappled by the mimic. Hit: 5 (1d4 + 3) piercing damage plus 2 (1d4) acid damage.