What you need is a way to get those costs down
I believe it was rightly banned in old Extended and should remain so in Legacy.
Digital-only cards have a long history of Magic with the first 12 showing up on Shandalar, a 90s video game version of Magic where players adventure along a map and dungeons battling AI opponents while building the strongest deck they can
Cheap key cards: Goblin Warchief, Skirk Prospector, Impact Tremors, Goblin Chieftain, Krenkos Command, Shamanic Revelation
Review that you have your cards in the correct order that your submission has them laid out
Your current mission might be unearthing that elusive shiny Charizard, tracking down a specific Special Illustration Rare to complete a master set, or securing a deck-defining staple card to crush your next regional championship