Lord Varys, the Spider

Skulk

At the beginning of each opponent's upkeep, that player creates a 1/1 black Human Rogue creature token with skulk and "At the beginning of your end step, reveal a card at random from your hand."

{3},{t}: Target opponent becomes the monarch. During that player's next turn, spells they cast cost {2} more to cast. Activate only as a sorcery.