Prowess ( Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) When Bedlam Reveler enters the battlefield, discard your hand, then draw three cards
While Un-sets (like Unglued, Unhinged, Unstable, Unsanctioned, and Unfinity) are playable Magic cards, they exist outside the typical tournament legality and feature whimsical, often rule-bending mechanics
Adventure cards debuted in Throne of Eldraine and came back on our second visit to the plane, cementing it as a theme of Eldraine sets
A second ability makes them even stronger once Arahbo takes the field, doubling attacking cats' stats if you pay a little mana
They'll mainly make their sales to other resellers, and I'm expecting it to be a game of musical chairs that ends with some scalpers getting burned as the music stops and prices plummet
There are even-CMC ways to cheat additional creatures into play, but you'll need to do some digging to find them