There are many important moments in the story, but the most crucialâ€”called â€œstory spotlightsâ€â€”are shown on cards. These cards have the Planeswalker symbol in their text box; this symbol has no effect on gameplay. You can read more about these events in the official Magic fiction at http://www.mtgstory.com.
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 spellâ€™s total cost. Then you can tap artifacts you control to help pay that cost. For example, if you cast Whir of Invention (a spell with improvise and mana cost ) and choose X to be 3, the total cost is . If you tap two artifacts, youâ€™ll have to pay .
When calculating a spellâ€™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.
Tapping an artifact wonâ€™t cause its abilities to stop applying unless those abilities say so.
Improvise doesnâ€™t change a spellâ€™s mana cost or converted mana cost.
Improvise canâ€™t pay for , , , , , or mana symbols in a spellâ€™s total cost.
Improvise canâ€™t be used to pay for anything other than the cost of casting the spell. For example, it canâ€™t be used during the resolution of an ability that says â€œCounter target spell unless its controller pays .â€
If the target creature becomes an illegal target, Battle at the Bridge doesnâ€™t resolve and none of its effects happen. You wonâ€™t gain life.
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 spellâ€™s costs. You wonâ€™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 wonâ€™t be on the battlefield when you pay the spellâ€™s costs, so you wonâ€™t be able to tap it for improvise.
Equipment attached to a creature doesnâ€™t become tapped when that creature becomes tapped, and tapping that Equipment doesnâ€™t cause the creature to become tapped.
Because improvise isnâ€™t an alternative cost, it can be used in conjunction with alternative costs.
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