It is a Metal card
Rat King, Pale Piper Rat King, Pale Piper turns any of your tokens into clues, and gives your side of the battlefield an exceedingly easy way to keep rats in play
greatly simplifies this and restricts its deck to Monster, Spell, and Trap cards, which are all direct and action-based
Card Set(s) -ROYAL BLOOD- [OP-10] CARD VIEW OP10-052 | C | CHARACTER Bartolomeo Attribute Special Block icon 3 Effect [Blocker] (After your opponent declares an attack, you may rest this card to make it the new target of the attack.) [On Play] Place up to 1 Character with a cost of 1 or less at the bottom of the owner's deck
You dont really want to set cards because thats vulnerable to destruction and you want to be able to negate things when going second on that turn
The front side is fairly costed, and the pseudo-cascade-plus-draw ability oozes value and naturally synergizes with Yorion in Pioneer