
Sliver creatures you control have "When this creature enters, Slivers you control get +1/+1 until end of turn if you're the monarch. Otherwise, you become the monarch."
Regal Sliver has 2 printings, first in Commander Masters (2023). EDHREC ranks it #10,091 among Commander cards. It appears most in The First Sliver decks (5,339 on EDHREC). 1 public deck on TCG runs it. It has 5 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.