Iron Star

Whenever a player casts a red spell, you may pay {1}. If you do, you gain 1 life.

Wooden Sphere

Whenever a player casts a green spell, you may pay {1}. If you do, you gain 1 life.

City of Brass

Whenever City of Brass becomes tapped, it deals 1 damage to you.
{T}: Add one mana of any color.

Forest

Blaze

Goblin Glider

Lava Axe

Lava Axe deals 5 damage to target player or planeswalker.

Defense Grid

Each spell costs {3} more to cast except during its controller's turn.

Brass Herald

As Brass Herald enters, choose a creature type.
When Brass Herald enters, reveal the top four cards of your library. Put all creature cards of the chosen type revealed this way into your hand and the rest on the bottom of your library in any order.
Creatures of the chosen type get +1/+1.

Goblin Raider

Shock

Wall of Stone

Mountain

Rampant Growth

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Goblin Chariot

Haste (This creature can attack and {T} as soon as it comes under your control.)

Monstrous Growth

Target creature gets +4/+4 until end of turn.

Goblin King

Other Goblins get +1/+1 and have mountainwalk.

Raging Goblin

Thorn Elemental

You may have Thorn Elemental assign its combat damage as though it weren't blocked.