mtg cards like soul's fire Dark Souls Proxy Commander Deck (A copy of a permanent spell becomes a token.) Fuego del alma MTG -

Inexorable Tide, Tekuthal, Inquiry Dominus, and Norn's Choirmaster are great proliferate cards that can add more counters to these creatures for you to eventually swing out for the win

If you assume each type of colour combination is played equally .There are 31 different colour combinations in magic, let us assume each is played equally although there is a bias towards the fewer coloured decks in reality which further enhances my point

But the rarest pulls are the Neon Ink Traveling Chocobos, which you can find only in Collector boosters

Its quite possible that this card is going to become a staple piece of removal in Standard over the next year

Whats interesting about Collector Boosters is that they dont contain cards that are intended to be played with at all