Rakdos Guildgate

Rakdos Guildgate enters tapped.
{T}: Add {B} or {R}.

Boros Guildgate

Boros Guildgate enters tapped.
{T}: Add {R} or {W}.

Gruul Guildgate enters tapped.
{T}: Add {R} or {G}.

{T}: Add {C}.
{2}, {T}: Target creature gets +X/+X until end of turn, where X is the number of Gates you control. Activate only as a sorcery.

{5}, {T}, Sacrifice Lightning-Core Excavator: It deals 3 damage to any target.

Enchant creature
Enchanted creature has "{T}: This creature deals damage equal to its power to any target."

Vigilance
Iron Golem attacks or blocks each combat if able.

{1}, {T}: Put a +1/+1 counter on Chronomaton.

Equipped creature has deathtouch and lifelink.
Equip {2}

Nonartifact spells cost {1} more to cast.

Menace (This creature can't be blocked except by two or more creatures.)
When Iron Bully enters, put a +1/+1 counter on target creature.

{T}: Add {C}.
{2}, {T}: Add X mana of any one color, where X is the number of other Gates you control.

Trample
{3}{R}, Sacrifice an artifact: Bosh, Iron Golem deals damage equal to the sacrificed artifact's mana value to any target.

Enchant Mountain
Enchanted Mountain is a 7/7 red Giant creature with haste. It's still a land.

Trample
When Bottle Golems dies, you gain life equal to its power.

Black Dragon Gate enters tapped.
As Black Dragon Gate enters, choose a color other than black.
{T}: Add {B} or one mana of the chosen color.

Bring Low deals 3 damage to target creature. If that creature has a +1/+1 counter on it, Bring Low deals 5 damage to it instead.

Target attacking creature gets +2/+2 until end of turn. Each attacking non-Human creature gains trample until end of turn.