Enchant artifact
Enchanted artifact's activated abilities cost less to activate. This effect can't reduce the mana in that cost to less than one mana.

Return all artifacts target player owns to their hand.

At the beginning of combat on your turn, this creature gains banding until end of combat. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's blocking.)
Whenever this creature becomes blocked by a Wall, destroy that Wall at end of combat.

Whenever an opponent casts an artifact spell, put a +1/+1 counter on this creature.

: Until your next upkeep, target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value.

: This creature gets +1/+0 until end of turn.

Players can't untap more than one artifact during their untap steps.

You may choose not to untap this creature during your untap step.
: Tap target artifact. It doesn't untap during its controller's untap step for as long as this creature remains tapped.

Vigilance

Gaea's Avenger's power and toughness are each equal to 1 plus the number of artifacts your opponents control.

Whenever an artifact you control is put into a graveyard from the battlefield, if it wasn't sacrificed, you may pay . If you do, draw a card.

Enchant artifact
Whenever enchanted artifact becomes tapped or a player activates an ability of enchanted artifact without in its activation cost, this Aura deals 2 damage to that artifact's controller.

, : Draw a card, then discard a card.

, Sacrifice an artifact: This creature deals 2 damage to any target.

: Prevent the next 2 damage that would be dealt to target artifact creature this turn.

, Discard a card at random: Target creature gets +2/+2 until end of turn.

Defender (This creature can't attack.)
First strike

All artifacts have "At the beginning of your upkeep, sacrifice this artifact unless you pay ."

Sacrifice a creature: Add .

, : Return target artifact card from your graveyard to your hand.

When this creature dies, you gain 2 life.

Destroy all artifacts. They can't be regenerated.

Attacking creatures get -1/-0.

: This creature deals 1 damage to target creature with flying.

Each noncreature artifact loses all abilities and becomes an artifact creature with power and toughness each equal to its mana value. If this enchantment leaves the battlefield, this effect continues until end of turn.

: Regenerate this creature.

As this artifact enters, choose an opponent.
The chosen player's maximum hand size is four.

, : Each nontoken permanent with a name originally printed in the Antiquities expansion is sacrificed by its controller.

, : Target creature with power 2 or less can't be blocked this turn.

Whenever an artifact becomes tapped or a player activates an artifact's ability without in its activation cost, this enchantment deals 1 damage to that artifact's controller.

When this creature dies, add .

, : Target creature gets -2/-0 until end of turn.

As this creature enters, it becomes your choice of a 3/3 artifact creature, a 2/2 artifact creature with flying, or a 1/6 Wall artifact creature with defender in addition to its other types. (A creature with defender can't attack.)

Attacking creatures get +1/+0.

You may choose not to untap this artifact during your untap step.
, : Exile target creature and all Auras attached to it. Note the number and kind of counters that were on that creature. When this artifact leaves the battlefield or becomes untapped, return that exiled card to the battlefield under its owner's control tapped with the noted number and kind of counters on it. If you do, return the other exiled cards to the battlefield under their owner's control attached to that permanent.

: This artifact deals 1 damage to any target. Destroy this artifact at the beginning of the next end step. Activate only if you've controlled this artifact continuously since the beginning of your most recent turn.