This is very different from, lets say, custom alter cards, as the art on those is the property of the people who make them, and also, you know you arent buying a real card. Play it safe if you print the back of an MTG card and put a custom-altered version on the front, and restrict its use to kitchen table rules
I have ways to ramp with Your Fate Is Thrice Sealed, ways to cheat big creatures from my deck into play with A Reckoning Approaches, and a powerful scheme to get big planeswalkers like Garruk, Apex Predator or Ugin, the Spirit Dragon in Perhaps You've Met My Cohort
More impressively than its Pioneer performance, however, Faerie Mastermind is also a powerhouse in Legacy
Izzet: Pros: Can play big artifacts quickly thanks to Saheeli, the Gifted
Single cards like Dread Return are good, but of course Rise of the Dark Realms is even better
If it damaged an opponent Diseased Vermin got an infection counter