You can sometimes "splash" a third, playing two colors as your base and a couple powerful cards or additional costs of another color, but I'd really focus on the two colors you want here
Trigger [Trigger] Activate this card's [On K type, trash 5 cards from the top of your deck
I especially like that you have so much control over the text box and I think it just looks more like a Magic card than Cardsmith creations
For example, a hyper-rare gold card, the highest rarity in the recent Scarlet and Violet era sets, is [often] worth less than a Special Illustration Rare, the rarity below hyper-rares. She explains that some Illustration Rares (IRs) are worth more than Special Illustration Rares (SIRs), and Mega Hyper Rares (also gold cards) are now some of the most expensive cards in the modern era and are even rarer than hyper-rares were. [22] Sports card and memorabilia collector Chris Frey says that each Pokmon set will have 3 or 4 special edition cards with different art and illustrations that people chase after
Furthermore, do you want to account for the opponent having some weird tricks like Thought Scour to mess up your pile