Ideal cases for wildcards are effects with a particular cost and effect, linked abilities, or effects that interact with particular zones in a certain order
Displaced Dinosaurs makes every artifact token you make (Treasure, Clues, and Food come to mind) into 7/7 creatures, and its not hard to make a ton of artifact tokens these days, whether Treasure in Golgari or Clues in Simic
Hakbal is also a source of ramp, considering every time he attacks, you can play out the lands you've expanded into
These have been revealed by the Final Fantasy social media team, and given their characters and color identity, its likely they will be the paired Commanders
Your opponent can be a friend or someone you find through platforms like Discord
It gains haste, then is removed from the game at end of turn