As you cast your first instant/sorcery each turn, you can exile a random one from that graveyard of yours and copy it, and then you can keep on copying it as you cast more and more instants and sorceries and exiling more options at random
If you have a foiled-out deck in need of this sideboard all-star, consider the alternate-art version by Jesper Ejsing
Enter the Infinite | Illustration by Jake Murray An infinite combo is a set of card interactions, abilities or effects that can be repeated over and over until you say when. The combo could produce infinite damage, infinite mana, and some give one of your creatures infinite power
That tends to favor the deck that isnt mono-black, and it sure felt great to pull that game out
It also dumps a handful of cards into the graveyard, which is critical for hard graveyard decks with Narcomoeba, Prized Amalgam, and Creeping Chill as well as softer graveyard decks with delirium or delve synergies
In my eyes it could have done with some better trigger/free card draw as youre already having to color fix and tap out most of the time just to get permanents on board and often times you simply dont have the mana left to cast cards like Abzan Charm or Sultai Charm