This wand has 7 charges for the following properties. It regains 1d6 + 1 expended charges daily at dawn. If you expend the wand's last charge, roll a d20. On a 1, the wand awakens as a wand mimic that is hostile towards you.

Spells.  While holding the wand, you can use an action to expend some of its charges to cast one of the following spells requiring no concentration (save DC 15): animate objects (1 charge) or true polymorph (4 charges).  If you cast true polymorph from the wand, the target turns into a mimic.

Mimic Making.  When you target a creature you made with an animate objects spell cast from this wand with a true polymorph spell cast from this wand, you can expend 1 charge to permanently transform that creature into a mimic.  The mimic sees you as its parent and is friendly to you and your companions until you or your companions do anything harmful to it. It understands your languages and obeys your spoken commands. If you issue no commands, the mimic defends itself but takes no other actions.  After you use property, you can't use it again until the mimic dies, is lost, or becomes hostile towards you.

The wand has a 50% chance of already being a mimic.  Casting the identify spell on the wand reveals if it is a mimic or not.  If the wand is revealed to be a mimic, how the mimic reacts to being discovered is up to the DM.

Wand Mimic

Tiny monstrosity (shapechanger), neutral

Armor Class 13 (Natural Armor)
Hit Points 40 (9d4 + 18)
Speed 20 ft., fly 40 ft. (hover)

Skills Arcana +4, Stealth +7

Damage Immunities acid

Condition Immunities prone

Senses darkvision 60 ft., passive Perception 15

Languages Common, Undercommon

Challenge 4 (1,100 XP)

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.

Actions

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.

Description

Mimics reproduce in a number of ways; budding, fission, live larva, and spores being the most common.  Wand mimics, however, introduce an unorthodox but strangely logical method of producing the next generation of mimics.  They harness magic to breathe life into everyday objects, and then awaken them, transforming them into fully developed mimics.  Though unconventional in its method of procreation, the wand mimic does manage to imprint on its magically made progeny, which identify the wand mimic as their parent.

Notes: Creation, Damage, Control, Buff, Shapechanging, Sentient, Focus