Tasha's concept is certainly fun and powerful, especially in Dimir where this sort of steal your stuff, play it later strategy is the norm
the only piece of the puzzle that we need to play a full playset of is Team Magma's Secret Base, because there's no way to access it apart from drawing and Trainers' Mail
Deck 10 10 Majesty Pegasus, the Dracoslayer Pendulum Monster Effect Monster - 4 Spellcaster 1500 1500 Pendulum EffectIf you have a "Dracoslayer" or "Majespecter" card in your other Pendulum Zone: You can add 1 "Dracoslayer" Pendulum Monster with a different original name than that card from your Deck to your hand, then you can destroy 1 card in your Pendulum Zone
Commander I guess
They are Diamond and Pearl, Mysterious Treasures, and Supreme Victors
Its ability is simple, but powerful: deal combat damage, get a +1/+1 counter