Melt Terrain

Destroy target land. Melt Terrain deals 2 damage to that land's controller.

Kuldotha Phoenix

Flying, haste
Metalcraft — {4}: Return Kuldotha Phoenix from your graveyard to the battlefield. Activate only during your upkeep and only if you control three or more artifacts.

Barrage Ogre

{T}, Sacrifice an artifact: Barrage Ogre deals 2 damage to any target.

Arc Trail

Arc Trail deals 2 damage to any target and 1 damage to another target.

Victorious Destruction

Destroy target artifact or land. Its controller loses 1 life.

Blisterstick Shaman

When Blisterstick Shaman enters, it deals 1 damage to any target.

Volt Charge

Volt Charge deals 3 damage to any target. Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Galvanic Blast

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

Mountain

Slash Panther

({R/P} can be paid with either {R} or 2 life.)
Haste

Spikeshot Elder

{1}{R}{R}: Spikeshot Elder deals damage equal to its power to any target.

Burn the Impure

Burn the Impure deals 3 damage to target creature. If that creature has infect, Burn the Impure deals 3 damage to that creature's controller.

Ruthless Invasion

({R/P} can be paid with either {R} or 2 life.)
Nonartifact creatures can't block this turn.

Rage Extractor

({R/P} can be paid with either {R} or 2 life.)
Whenever you cast a spell with {H} in its mana cost, Rage Extractor deals damage equal to that spell's mana value to any target.

Blade-Tribe Berserkers

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

Moltensteel Dragon

({R/P} can be paid with either {R} or 2 life.)
Flying
{R/P}: Moltensteel Dragon gets +1/+0 until end of turn.

Concussive Bolt

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.

Urabrask the Hidden

Creatures you control have haste.
Creatures your opponents control enter tapped.

Galvanoth

At the beginning of your upkeep, you may look at the top card of your library. You may cast it without paying its mana cost if it's an instant or sorcery spell.