Bastion Inventor

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you’re done activating mana abilities pays for .)
Hexproof (This creature can’t be the target of spells or abilities your opponents control.)

Sly Requisitioner

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you’re done activating mana abilities pays for .)
Whenever a nontoken artifact you control is put into a graveyard from the battlefield, create a 1/1 colorless Servo artifact creature token.

Sweatworks Brawler

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

Fen Hauler

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you’re done activating mana abilities pays for .)
Fen Hauler can’t be blocked by artifact creatures.

Maverick Thopterist

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you’re done activating mana abilities pays for .)
When Maverick Thopterist enters, create two 1/1 colorless Thopter artifact creature tokens with flying.

Metallic Rebuke

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 .

Wind-Kin Raiders

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

Reverse Engineer

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you’re done activating mana abilities pays for .)
Draw three cards.

Herald of Anguish

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you’re done activating mana abilities pays for .)
Flying
At the beginning of your end step, each opponent discards a card.
, Sacrifice an artifact: Target creature gets -2/-2 until end of turn.

Freejam Regent

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you’re done activating mana abilities pays for .)
Flying
: Freejam Regent gets +2/+0 until end of turn.

Whir of Invention

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you’re done activating mana abilities pays for .)
Search your library for an artifact card with mana value X or less, put it onto the battlefield, then shuffle.

Reverse Engineer

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you’re done activating mana abilities pays for .)
Draw three cards.