Fen Hauler

six generic mana one black mana Creature — InsectPower and toughness5/5

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

This creature can't be blocked by artifact creatures.

"Success is found where others fear to look." —Ara, renegade smuggler

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Fen Hauler rulings

2017-02-09
Improvise doesn't change a spell's mana cost or mana value.
2017-02-09
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.
2017-02-09
Because improvise isn't an alternative cost, it can be used in conjunction with alternative costs.
2017-02-09
Improvise can't pay for , , , , , or mana symbols in a spell's total cost.
2017-02-09
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 ."
2017-02-09
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.
2017-02-09
Tapping an artifact won't cause its abilities to stop applying unless those abilities say so.
2017-02-09
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.

Fen Hauler 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.