Molten Nursery

Devoid (This card has no color.)
Whenever you cast a colorless spell, Molten Nursery deals 1 damage to any target.

Nettle Drone

Devoid (This card has no color.)
{T}: Nettle Drone deals 1 damage to each opponent.
Whenever you cast a colorless spell, untap Nettle Drone.

Until end of turn, target creature gains "{T}: Return target nonland permanent to its owner's hand."

{3}, Sacrifice Herbal Poultice: Regenerate target creature.

Battered Golem doesn't untap during your untap step.
Whenever an artifact enters, you may untap Battered Golem.

Counter target spell that targets a permanent you control.

Swiftwater Cliffs enters tapped.
When Swiftwater Cliffs enters, you gain 1 life.
{T}: Add {U} or {R}.

Sacrifice Welding Jar: Regenerate target artifact.

Draw three cards. Then discard two cards unless you discard an artifact card.