A short list can't cover everything but here is the gist of how you play
Enchantment Royal Decree Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) Whenever a Swamp, Mountain, black permanent, or red permanent becomes tapped, this enchantment deals 1 damage to that permanent's controller
That shuts down things like Force of Will or Fierce Guardianship, pretty commonly played in Commander
Im usually focusing my MTG resources on Old School and Reserved List cards, but every once in a while, a new set is interesting enough to give me the itch
Extra Cards
1 Extended-art rare or mythic rare from Phyrexia: All Will Be One Commander decks (ONC), or an extended-art card from ONE Jumpstart There are a total of 28 rares (92%) and 5 mythic rares (8%) that are found in this slot