Improvise (Your artifacts can help cast this spell. Each artifact you tap after you’re done activating mana abilities pays for .)
Counter target spell unless its controller pays .
"Too little, too late. The machine is in motion."n—Tezzeret
Tapping an artifact won't cause its abilities to stop applying unless those abilities say so.
07-08-2020
wotc
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.
07-08-2020
wotc
Improvise doesn't change a spell's mana cost or mana value.
07-08-2020
wotc
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.
07-08-2020
wotc
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.
07-08-2020
wotc
Improvise can't pay for {U} in Metallic Rebuke's total cost.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.
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Eric Deschamps2017-01-20
