Voltaic Key

Cards like Voltaic Key in Urza's Saga:

Thran Turbine

Artifact

At the beginning of your upkeep, you may add . You can't spend this mana to cast spells.

6.8 /10

$1.86

Endoskeleton

Artifact

You may choose not to untap Endoskeleton during your untap step.
, : Target creature gets +0/+3 for as long as Endoskeleton remains tapped.

1.5 /10

$0.22

Karn, Silver Golem

Legendary Artifact Creature — Golem (4/4)

Whenever Karn, Silver Golem blocks or becomes blocked, it gets -4/+4 until end of turn.
: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn.

7 /10

~$16

Phyrexian Colossus

Artifact Creature — Phyrexian Golem (8/8)

Phyrexian Colossus doesn't untap during your untap step.
Pay 8 life: Untap Phyrexian Colossus.
Phyrexian Colossus can't be blocked except by three or more creatures.

3.5 /10

$1.33

Chimeric Staff

Artifact

: Chimeric Staff becomes an X/X Construct artifact creature until end of turn.

1.7 /10

$0.42

Copper Gnomes

Artifact Creature — Gnome (1/1)

, Sacrifice Copper Gnomes: You may put an artifact card from your hand onto the battlefield.

4 /10

$1.71

Dragon Blood

Artifact

, : Put a +1/+1 counter on target creature.

3.9 /10

$0.21

Metrognome

Artifact

When a spell or ability an opponent controls causes you to discard Metrognome, create four 1/1 colorless Gnome artifact creature tokens.
, : Create a 1/1 colorless Gnome artifact creature token.

1.9 /10

$0.34

Mishra's Helix

Artifact

, : Tap X target lands.

2.6 /10

$2.43

Pit Trap

Artifact

, , Sacrifice Pit Trap: Destroy target attacking creature without flying. It can't be regenerated.

2.2 /10

$0.22

Barrin's Codex

Artifact

At the beginning of your upkeep, you may put a page counter on Barrin's Codex.
, , Sacrifice Barrin's Codex: Draw X cards, where X is the number of page counters on Barrin's Codex.

2.7 /10

$0.38

Cathodion

Artifact Creature — Construct (3/3)

When Cathodion dies, add .

7.4 /10

$0.30

Citanul Flute

Artifact

, : Search your library for a creature card with mana value X or less, reveal it, put it into your hand, then shuffle.

5.8 /10

$3.17

Claws of Gix

Artifact

, Sacrifice a permanent: You gain 1 life.

8.1 /10

$1.59

Crystal Chimes

Artifact

, , Sacrifice Crystal Chimes: Return all enchantment cards from your graveyard to your hand.

8.2 /10

$1.95

Fluctuator

Artifact

Cycling abilities you activate cost up to less to activate.

7.4 /10

$3.79

Grafted Skullcap

Artifact

At the beginning of your draw step, draw an additional card.
At the beginning of your end step, discard your hand.

4.5 /10

$0.79

Hopping Automaton

Artifact Creature — Construct (2/2)

: Hopping Automaton gets -1/-1 and gains flying until end of turn.

0.6 /10

$0.23

Lifeline

Artifact

Whenever a creature dies, if another creature is on the battlefield, return the first card to the battlefield under its owner's control at the beginning of the next end step.

6 /10

~$23

Lotus Blossom

Artifact

At the beginning of your upkeep, you may put a petal counter on Lotus Blossom.
, Sacrifice Lotus Blossom: Add X mana of any one color, where X is the number of petal counters on Lotus Blossom.

6.3 /10

$1.94

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