
Nonartifact spells you cast have improvise. (Your artifacts can help cast those spells. Each artifact you tap after you're done activating mana abilities pays for .)
Illustrated by Kirsten Zirngibl · Historic Anthology 4 · #23
2017-02-09
Multiple instances of improvise are redundant.
2017-02-09
If you cast a nonartifact spell that requires you to sacrifice a permanent as an additional cost, you may tap that permanent (if it's an artifact) for the spell's improvise ability before you sacrifice it to pay that cost.