Unfinity

Legendary Creature — Human Gamer

As Vorthos, Steward of Myth enters, choose a named Magic character.
Each spell you cast with the chosen character in its name, flavor text, or art costs {W}{U}{B}{R}{G} less to cast. This effect reduces only the amount of colored mana you pay.

Vorthos, Steward of Myth

Legendary Creature — Angel Performer

Flying
When Angelic Harold enters, you may put a name sticker on a nonland permanent you own.
Each creature you control with three or more words in its name gets +1/+1.

Angelic Harold

Legendary Creature — Human Rogue

When "Brims" Barone, Midway Mobster enters, put a +1/+1 counter on each other creature you control that has a hat.
"Brims" Barone, Midway Mobster has menace as long as you're wearing a hat.

"Brims" Barone, Midway Mobster

Legendary Creature — Human Performer

Whenever you cast an instant or sorcery spell from your hand, open an Attraction.
{X}, {T}: Exile target instant or sorcery card with mana value X from your graveyard and choose an Attraction you control that doesn't have a midway counter on it. Put a midway counter on it. For as long as that Attraction is on the battlefield, whenever you visit it, copy the exiled card. You may cast the copy without paying its mana cost.

Myra the Magnificent

Pietra, Crafter of Clowns

Clown Robot

Legendary Creature — Human Clown Artificer

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.