MTG Keyword Rules — Comprehensive Rules Glossary

Look up keyword abilities and keyword actions from the Magic: The Gathering Comprehensive Rules

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Improvise

702.126 Keyword Ability
702.126a

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.”

702.126b

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

702.126c

Multiple instances of improvise on the same spell are redundant.