Reverse Engineer

Card text

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)

Draw three cards.

The Hold, an illegal research facility in a derelict merchant ship, became a wellspring of renegade intelligence.

Market price

Latest aggregated market price for the normal finish of this printing: $0.19 (as of 2026-11-11).

The figure covers this printing only; other printings carry their own price on their own page.

Format legality

Legality of Reverse Engineer by format. Formats in which it is not legal are not listed.

Other printings of Reverse Engineer

Reverse Engineer has been printed in 7 sets. The other printings are listed newest first, with the rarity and release year of each.

Official rulings

The 8 most recent official rulings for Reverse Engineer, newest first.

• 2018-07-13 Improvise doesn't change a spell's mana cost or mana value.
• 2018-07-13 When 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.
• 2018-07-13 Improvise can't pay for {W}, {U}, {B}, {R}, {G}, or {C} mana symbols in a spell's total cost.
• 2018-07-13 Tapping an artifact won't cause its abilities to stop applying unless those abilities say so.
• 2018-07-13 Equipment 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.
• 2018-07-13 If 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.
• 2018-07-13 When 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}.
• 2018-07-13 Improvise 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}.”

Similar cards

Other sorcery cards with a blue colour identity, ranked by how often they appear in Commander decks.

• Ponder
• Windfall