Perhaps moreso than any other card on this list, Faerie Seer benefits from being played over and over again
I do not have Pact of Negation in my cube presently however its value rapidly increases as the number of suitable archetypes for it increases and with cube design being as diverse as it is you can easily include more of those archetypes from one of a few different approaches
For those that may have zero idea what Magic: The Gathering is, here is an incredibly brief gist of the game - players build decks of spells and creatures that are composed of five color options - red, blue, white, green, and black (colorless is also an option) - with the goal of being the last person with any life points remaining
Given how T'Challa works, you're not going to be short of colorless mana to cast artifacts, yet of the 24 artifacts in this deck, a quarter of them are mana generators
Thankfully, you can spend your wild cards in Magic Arena wisely by crafting cards that are just generically powerful
Gilgamesh, Master-at-Arms Giglameshs card advantage and mana cheating are powerful as it gets equipment out cheap, and skips the equip cost, giving him an advantage over Godo, Bandit Lord