Reverse Engineer

Format legality

Where you can play Reverse Engineer in sanctioned and popular formats.

All printings (7)

Prices range from $0.18 to $0.47 across finishes. Cheapest printing: Commander Masters at $0.18.

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Rulings

Official rulings from Wizards of the Coast (8).

• 2018-07-13Equipment attached to a creature doesn't become tapped when that creature becomes tapped, and tapping that Equipment doesn't cause the creature to become tapped.
• 2018-07-13When using improvise to cast a spell with {X} in its mana cost, first choose the value for X. That choice, plus any cost increases or decreases, will determine the spell's total cost. Then you can tap artifacts you control to help pay that cost. For example, if you cast Saheeli's Directive and choose X to be 3, the total cost is {3}{R}{R}{R}. If you tap two artifacts, you'll have to pay {1}{R}{R}{R}.
• 2018-07-13Improvise doesn't change a spell's mana cost or mana value.
• 2018-07-13When calculating a spell's total cost, include any alternative costs, additional costs, or anything else that increases or reduces the cost to cast the spell. Improvise applies after the total cost is calculated.
• 2018-07-13Improvise can't pay for {W}, {U}, {B}, {R}, {G}, or {C} mana symbols in a spell's total cost.
• 2018-07-13Improvise can't be used to pay for anything other than the cost of casting the spell. For example, it can't be used during the resolution of an ability that says “Counter target spell unless its controller pays {3}.”
• 2018-07-13If an artifact you control has a mana ability with {T} in the cost, activating that ability while casting a spell with improvise will result in the artifact being tapped when you pay the spell's costs. You won't be able to tap it again for improvise. Similarly, if you sacrifice an artifact to activate a mana ability while casting a spell with improvise, that artifact won't be on the battlefield when you pay the spell's costs, so you won't be able to tap it for improvise.
• 2018-07-13Tapping an artifact won't cause its abilities to stop applying unless those abilities say so.

Frequently asked questions