Out of all the characters to be revealed so far, the one trainer whose Pokmon are sure to create the best competitive deck is absolutely N from the Generation 5 games
One bottleneck for decks that generate a lot of mana is not having enough things to do with that mana
For every playable legend, though, there were two really bad ones
Defiler Of Vigor Since you are playing a creature-based deck, Defiler of Vigor will put +1/+1 counters whenever you cast green permanent spells
The Moxen (Mox Sapphire, Mox Jet, etc.) What it does: A set of five zero-cost artifacts that each tap for one colored mana
You can absolutely create cards featuring yourself, a pet, an original character you created, or a friend (with their permission)