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Disallow | Instant | | Counter target spell, activated ability, or triggered ability. (Mana abilities can't be targeted.) | Min Yum
Metallic Rebuke | Instant | | Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)
Counter target spell unless its controller pays {3}. | Eric Deschamps
Whir of Invention | Instant | | Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)
Search your library for an artifact card with mana value X or less, put it onto the battlefield, then shuffle. | Christine Choi
