Reverse Engineer

three generic mana one blue mana Sorcery

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

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

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Showing Aether Revolt#42

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0.19 $

Foil 0.47 $

36 printings · up to 0.36 $

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Reverse Engineer rulings

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
When using improvise to cast a spell with 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 . If you tap two artifacts, you'll have to pay .
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 , , , , , or mana symbols in a spell's total cost.
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 .”
2018-07-13
If an artifact you control has a mana ability with 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
Tapping an artifact won't cause its abilities to stop applying unless those abilities say so.

Reverse Engineer keyword rules

Improvise Rule 702.126

Improvise is a static ability that functions while the spell with improvise is on the stack. “Improvise” means “For each generic mana in this spell’s total cost, you may tap an untapped artifact you control rather than pay that mana.”

The improvise ability isn’t an additional or alternative cost and applies only after the total cost of the spell with improvise is determined.

Multiple instances of improvise on the same spell are redundant.