They have to be fanmade
After every battle, you get a certain amount of experience split up amongst everyone that participated

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He claimed that Ai had been lying to Playmaker and that he couldn't be trusted, but Playmaker claimed that Ai wasn't his friend and affirmed his desire to defeat Varis
However, I think some of these cards can find spots in other builds, and maybe you're out of the best removal in your color but still want some options, so its worth keeping them in mind when youre putting together something new
Heads: This card can make a second attack during each Battle Phase, but if it does so using this effect, change it to Defense Position at the end of the Battle Phase