In this case, such cards are highly valued among collectors, and you should keep them in card sleeves
(To mill a card, a player puts the top card of their library into their graveyard.) Legendary Creature - Vampire Rogue Gonti, Lord of Luxury Deathtouch When Gonti enters, look at the top four cards of target opponent's library, exile one of them face down, then put the rest on the bottom of that library in a random order
If you dont care about interacting with your opponents stuff, you can also use Sin, Unending Cataclysm to reset your sagas to the prologue, remove finality or -1/-1 counters, and all kinds of other things
During each End Phase: you can add 1 Spell or Trap that mentions the monster card types Fusion, Synchro and Xyz in its text, from your Deck to your hand