Enchant artifact or land
Enchanted permanent has "{T}: Target player adds two mana of any one color. The next spell they cast this turn has cascade." (When they cast their next spell, they exile cards from the top of their library until they exile a nonland card that costs less. They may cast it without paying its mana cost. They put the exiled cards on the bottom in a random order.)
Bigger on the Inside has 2 listed printings; the most valuable is the Surge Foil printing from WHO at US$18.68 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.
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