Why are monsters clowns?

Because it symbolizes the starting point and the end point, symbolizing infinite possibilities.

The clown card corresponds to the "fool" of the tarot card. Fool's card is very special in tarot cards, not only 0, but also the last of 22 main cards.

Poker stands for two meanings: one refers to cards, and the other refers to games played with cards as game props, which are called poker games, such as Texas Hold 'em. There are 54 cards in a deck of playing cards, of which 52 are original cards and the other 2 are secondary cards (King and Xiao Wang).