Keyword: Metalcraft

Tap target creature.
Metalcraft — If you control three or more artifacts, exile that creature.

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.

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.

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.

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.

Metalcraft — : Tap target artifact, creature, or land. Activate this ability only if you control three or more artifacts.

Each player shuffles the cards from their hand into their library, then draws that many cards.
Metalcraft — If you control three or more artifacts, Molten Psyche deals damage to each opponent equal to the number of cards that player has drawn this turn.

Metalcraft — Rusted Relic is a 5/5 Golem artifact creature as long as you control three or more artifacts.

Metalcraft — As long as you control three or more artifacts, Ezuri’s Brigade gets +4/+4 and has trample.

Metalcraft — Carapace Forger gets +2/+2 as long as 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.