Killer Clown

Killer Clowns are terrifying clowns usually occupying dollhouse and carnival levels. The first was a toy clown called Pierrot in Castlevania: Chronicles and can be found in the Tower of Dolls with other toys. Later versions were human sized and throw playing cards as weapons.

In Castlevania: Dawn of Sorrow, this is fairly powerful enemy. Its soul allows you to toss cards in a horizontal direction.

In Castlevania: Portrait of Ruin, the enemy is seen tossing cards from one hand to another and when a few seconds have passed, three large cards fly at the character and he shouts "Let's play!"

Trivia

 * In Dawn of Sorrow, the cards have pictures of characters on them. Jacks are Yoko, Queens are Mina, Kings are Hammer, Aces are Julius, and Jokers are Alucard.
 * Incidentallly, the faces and suits on each card mirror G-Gundam's Shuffle Alliance