Keyword: Metalcraft

Whenever an Equipment enters the battlefield under your control, you may draw a card.
Metalcraft — Equipment you control have equip as long as you control three or more artifacts.

Target creature gets +2/+2 until end of turn.
Metalcraft — That creature gets +4/+4 until end of turn instead if you control three or more artifacts.

Defender
Metalcraft — As long as you control three or more artifacts, Spire Serpent gets +2/+2 and can attack as though it didn’t have defender.

Metalcraft — Ardent Recruit gets +2/+2 as long as you control three or more artifacts.

Concussive Bolt deals 4 damage to target player or planeswalker.
Metalcraft — If you control three or more artifacts, creatures controlled by that player or by that planeswalker’s controller can’t block this turn.

Metalcraft — Razorfield Rhino gets +2/+2 as long as you control three or more artifacts.

Metalcraft — Spiraling Duelist has double strike as long as you control three or more artifacts.

Flying, haste
Metalcraft — : Return Kuldotha Phoenix from your graveyard to the battlefield. Activate this ability only during your upkeep and only if you control three or more artifacts.

Metalcraft — Auriok Edgewright has double strike as long as you control three or more artifacts.

Flying
Metalcraft — Whenever Screeching Silcaw deals combat damage to a player, if you control three or more artifacts, that player mills four cards.

Metalcraft — Ghalma’s Warden gets +2/+2 as long as you control three or more artifacts.

Metalcraft — When Bleak Coven Vampires enters the battlefield, if you control three or more artifacts, target player loses 4 life and you gain 4 life.

Metalcraft — This spell costs less to cast if you control three or more artifacts.
Counter target spell.

Flying, haste
Metalcraft — : Return Kuldotha Phoenix from your graveyard to the battlefield. Activate this ability only during your upkeep and only if you control three or more artifacts.

Flying
Metalcraft — Artifacts you control have shroud as long as you control three or more artifacts. (An artifact with shroud can’t be the target of spells or abilities.)

Metalcraft — : Add one mana of any color. Activate this ability only if you control three or more artifacts.

Flying
Metalcraft — When Lumengrid Drake enters the battlefield, if you control three or more artifacts, return target creature to its owner’s hand.

Galvanic Blast deals 2 damage to any target.
Metalcraft — Galvanic Blast deals 4 damage instead if you control three or more artifacts.

Metalcraft — Etched Champion has protection from all colors as long as you control three or more artifacts.

Metalcraft — When Blade-Tribe Berserkers enters the battlefield, if you control three or more artifacts, Blade-Tribe Berserkers gets +3/+3 and gains haste until end of turn.

Metalcraft — Snapsail Glider has flying as long as you control three or more artifacts.

Metalcraft — As long as you control three or more artifacts, Auriok Sunchaser gets +2/+2 and has flying.

Flying
Metalcraft — : Exile Argent Sphinx. Return it to the battlefield under your control at the beginning of the next end step. Activate this ability only if you control three or more artifacts.

Metalcraft — Chrome Steed gets +2/+2 as long as you control three or more artifacts.

Target player sacrifices an attacking creature.
Metalcraft — That player sacrifices two attacking creatures instead if you control three or more artifacts.