Dont throw away your miscut, misprinted, or altered cards
Some folks who have built this have insisted on Unifnity cards with acorns and played Brims Barone, Midway Mobster for those bonuses
Near Mint Umbreon cards typically command premium prices, while PSA 10 graded copies can sell for multiples of their raw card value
You could also go artifacts or enchantments, since there are also many artifact creatures and enchantment creatures, especially ones that would give you additional cost reduction
I'm an OG with Pokemon cards, having been collecting and battling on and off with what is arguably one of the best card games for around 20 years, give or take
Regigigas #130 (Pokemon Astral Radiance | Pokemon Cards) prices are based on the historic sales