So far, I only have a few monsters. I tried not to be overpowered, but... well, I remembered Red-Eyes Black Dragon existed. Shenanigans ensued and now my monsters are STACKED. Here's what I have so far (like I said, it's only monsters):
Dark Magician
Celtic Guardian
Kuriboh
Red-Eyes Black Dragon
Summoned Skull
Curse of Dragon
Gaia, the Fierce Knight
Flame Swordsman
Reaper Of the Cards
Winged Dragon, Guardian of the Fortress
Time Wizard, and
Baby Dragon
I'm already thinking of some Magic and Trap Cards to add, such as:
Polymerization
Mirror Force
Sword and Shield
Defense Paralysis
Pot of Greed
Dragon Capture Jar
Reborn The Monster
Recall, and
Change of Heart