There are a ton of applications, but Ive been most intrigued some unfair ones, specifically a few infinite combos the community has identified and that could drive the market
5 Galuf And Krile (Final Fantasy 5) Grandfather And Daughter Galuf and Krile are two of the party members of Final Fantasy 5, with Krile replacing Galuf later in the game with all of his stats and progress in various Jobs
Granting illusionary drawback Blue is the color of illusions, so we have given it what we now call the "illusion drawback" (previously called "skulking" after Skulking Ghost, when the ability was in black), which forces the controller of the creature to sacrifice it if it is ever targeted
For this reason, its banned in Modern and restricted in Vintage to limit the power of dredge decks
Background looks to play around in that space a little more, opening up the possibilities a little more than Partner with without going full on into Partner territory