Blightsteel Colossus

Trample, infect, indestructible
If Blightsteel Colossus would be put into a graveyard from anywhere, reveal Blightsteel Colossus and shuffle it into its owner's library instead.

Command Tower

{T}: Add one mana of any color in your commander's color identity.

Tarrian's Soulcleaver

Equipped creature has vigilance.
Whenever another artifact or creature is put into a graveyard from the battlefield, put a +1/+1 counter on equipped creature.
Equip {2}

Diamond Weapon

This spell costs {1} less to cast for each permanent card in your graveyard.
Reach
Immune — Prevent all combat damage that would be dealt to Diamond Weapon.

Farseek

Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.

Emissary Escort

This creature gets +X/+0, where X is the greatest mana value among other artifacts you control.

Meteor Golem

When this creature enters, destroy target nonland permanent an opponent controls.

Aloy, Savior of Meridian

Vigilance, reach
In You, All Things Are Possible — Whenever one or more artifact creatures you control attack, discover X, where X is the greatest power among them. (Exile cards from the top of your library until you exile a nonland card with that mana value or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)