Opus — Whenever you cast an instant or sorcery spell, target player mills three cards. If five or more mana was spent to cast that spell, that player mills ten cards instead.
Exhibition Tidecaller has 3 listed printings; the most valuable is the Promo Pack printing from PSOS at US$1.50 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.
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