ancient mew pokemon card back with 2 different types of holographic on back. : r/PokemonMisprints but the card can still be sleeve playable PSA9 Ancient Mew Promo Strikes

with striking patterns that for example show lightning bolts or leaves if the Pokemons type is Lightning or Grass, respectively

You wont get much of a mana discount casting goats, howeverno multicolor goats have been printed in the history of the game

Available in English edition at Universe TCG, Spain's premier destination for authentic sealed Disney Lorcana products, this booster box delivers the complete opening experience for competitive players building tournament-ready decks and collectors pursuing the most elusive rare and legendary cards from the Winterspell set (Set 11)

Just think of how many great instants and sorceries are in that range in Modern and Pioneer

Creeping Renaissance is another interesting option, and I'm still not sure if this build needs more recursion or not