Ticking Mime Bomb

When this creature enters, without speaking or indicating any specific creature, pantomime to a person outside the game, then they choose a creature you don't control. This creature deals damage equal to twice the number of Robots you control to the chosen creature.

Juggletron

Trample
Whenever this creature attacks, you may put an art sticker on it.
This creature gets +3/+0 for each item in its art that's not touching Juggletron, another item, or the card frame.

One-Clown Band

{2}{R}: Target Robot gets +2/+0 until end of turn.

Pietra, Crafter of Clowns

Haste
Robots you control get +1/+1.
{R}{W}, {T}, Tell a joke you haven't told this game to someone outside the game: Create a 1/1 white Clown Robot artifact creature token. If that person laughed, the token gains haste until end of turn.

Assembled Ensemble

Vigilance
Assembled Ensemble's power is equal to the number of Robots you control.
Whenever you cast a spell with an artifact creature in its art, create a 1/1 white Clown Robot artifact creature token.

Non-Human Cannonball

When this creature dies, roll a six-sided die. If the result is 4 or less, this creature deals that much damage to you.

Robo-Piñata

When Robo-Piñata dies, choose one —
• You get {TK}{TK}.
• You may put a sticker on a nonland permanent you own.

Celebr-8000

At the beginning of combat on your turn, roll two six-sided dice. For each result of 1, this creature gets +1/+1 until end of turn. For each other result, it gains the indicated ability until end of turn. If you rolled doubles, it also gains double strike until end of turn.
• 2 — menace
• 3 — vigilance
• 4 — lifelink
• 5 — flying
• 6 — indestructible

D00-DL, Caricaturist

When D00-DL, Caricaturist enters, create a 4/4 colorless Sketch creature token, which you have fifteen seconds to draw. The token has flying if it has wings in its art. The same is true for first strike and a sword, vigilance and a shield, menace and mean eyes, trample and horns, deathtouch and claws, lifelink and fangs, and haste and footwear.

Pie-roclasm

This creature deals π damage to each non-Clown creature. (How to calculate π isn't important. It's a smidgen more than 3.)

Omniclown Colossus

Affinity for Clowns (This spell costs {1} less to cast for each Clown you control.)
Trample