mtg slug cards Catacomb Magic the Gathering Card Quicksand Keychain – KeychainMonster put a slime counter on each creature you dont control Amazon.com: Magic: the Gathering -

For easy reference, here are all the non-legendary FCA cards that you don't want to see taking up that precious FCA slot in a booster pack: Light Up the StageLight Up the Stage Laboratory ManiacLaboratory Maniac Strixhaven StadiumStrixhaven Stadium Wall of OmensWall of Omens Stroke of MidnightStroke of Midnight Nature's ClaimNature's Claim Deadly DisputeDeadly Dispute Lightning BoltLightning Bolt FarseekFarseek Smuggler's CopterSmuggler's Copter Mizzix's MasteryMizzix's Mastery Dovin's VetoDovin's Veto CounterspellCounterspell Fatal PushFatal Push BrainstormBrainstorm Chromatic LanternChromatic Lantern Cryptic CommandCryptic Command Command BeaconCommand Beacon Carpet of FlowersCarpet of Flowers A Promise Fulfilled And there you have it

However, Marvel Super Heroes introduced some dedicated support cards

This is a little overcosted, but being a 4-mana noncreature spell and an Equipment has serious value in this set

Still, this will only produce colorless mana if you get it early and thats pretty rough This tries to address the problem that most caves only produce colorless, and thats a huge hit to your mana base if youre not careful