Shardless Agent is a uncommon Artifact Creature — Human Rogue card from The List (PLST), collector number PCA-104. Current market price: $0.32, TCGplayer market prices via Scryfall.
Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)