Braids, Arisen Nightmare Braids, Cabal Minion is banned in EDH, so the second coming of Braids had to deliver
Qala, Ajanis Pridemate Oh, how quaint
On the note of budget, each wildcard costs the same and is earned the same way in their given rarities, thus, if you spend a wildcard on a super expensive common or mythic, you can play with cards that would cost a fortune IRL
They let you draw or tutor cards, attach energy to your Pokemon (thereby getting around the one energy per turn from hand limitation) or move Pokemon around, both yours and your opponent's
Removing counters from a saga lets you control its chapter abilities
There are also special designs for cards returning as alt-arts that have the image breaking the frame like this one