When your opponent adds a card(s) from the Graveyard to their hand: They must shuffle 1 of those cards into their Deck
This calculation only takes into account English-language printings, so while you will end up with 21 Teferi, Master of Time, you won't end up with 21 English versions, 21 Japanese versions, and 21 Russian versions (etc.)
Glade Watcher + Returned Phalanx + Wishful Merfolk So theres this stream of 2-mana 3/3s or 3/2s that you can pump 1 or 2 mana into to make them attack
That means the overall card has a red and white colour identity, so can only be used with Commanders that have red and white in their colour identity (Boros, Mardu, Naya, or Jeskai)
By using the right size sleeves, handling the cards gently, and investing in quality materials, you can protect your valuable collection for years to come