If you are searching how to make Pokemon cards with Gemini AI, focus on consistency first: keep the same border, icon positions, and text box sizes, then only change the creature, type, and background
As you likely know, lifegain for its own sake is awful but incidental lifegain is often outstanding
But there are also special releases that collectors track separately
First, it's very fun
UR Ultra Rare The Fang of Critias X SPELL (This card is also always treated as "Legendary Dragon Critias".) Send 1 Trap from your hand or field to the GY, that is listed on a Fusion Monster that can only be Special Summoned with "The Fang of Critias" (if that card is Set, reveal it), then Special Summon that Fusion Monster from your Extra Deck
Other players like mono-red aggro, Golgari midrange, and Mardu discard exist in small numbers, too