Manifold Key

{1}, {T}: Untap another target artifact.
{3}, {T}: Target creature can't be blocked this turn.

Mountain

Whenever an artifact is put into a graveyard from the battlefield, you may have target opponent lose 1 life.

{1}, {T}, Sacrifice Chromatic Sphere: Add one mana of any color. Draw a card.

{U}, Sacrifice Aether Spellbomb: Return target creature to its owner's hand.
{1}, Sacrifice Aether Spellbomb: Draw a card.

As Pithing Needle enters, choose a card name.
Activated abilities of sources with the chosen name can't be activated unless they're mana abilities.

{R}, Sacrifice Pyrite Spellbomb: It deals 2 damage to any target.
{1}, Sacrifice Pyrite Spellbomb: Draw a card.

{T}: Target player exiles a card from their graveyard.
{1}, Sacrifice Scrabbling Claws: Exile target card from a graveyard. Draw a card.

Sacrifice Welding Jar: Regenerate target artifact.

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Draw two cards.

{B}, Sacrifice Necrogen Spellbomb: Target player discards a card.
{1}, Sacrifice Necrogen Spellbomb: Draw a card.

Sacrifice an artifact: Atog gets +2/+2 until end of turn.

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)