Red Elemental Blast

Choose one —
• Counter target blue spell.
• Destroy target blue permanent.

Goblins of the Flarg

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)
When you control a Dwarf, sacrifice Goblins of the Flarg.

Forest

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Goblin Flotilla

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
At the beginning of each combat, unless you pay {R}, whenever Goblin Flotilla blocks or becomes blocked by a creature this combat, that creature gains first strike until end of turn.

Scarwood Goblins

Goblin Digging Team

{T}, Sacrifice Goblin Digging Team: Destroy target Wall.

Goblin Shrine

Enchant land
As long as enchanted land is a basic Mountain, Goblin creatures get +1/+0.
When Goblin Shrine leaves the battlefield, it deals 1 damage to each Goblin creature.

Shatter

Fastbond

You may play any number of lands on each of your turns.
Whenever you play a land, if it wasn't the first land you played this turn, Fastbond deals 1 damage to you.

Active Volcano

Choose one —
• Destroy target blue permanent.
• Return target Island to its owner's hand.

Tsunami

Giant Growth

Target creature gets +3/+3 until end of turn.

Mountain Yeti

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)
Protection from white

Birds of Paradise

Goblin Caves

Enchant land
As long as enchanted land is a basic Mountain, Goblin creatures get +0/+2.

Goblin King

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

Winds of Change

Each player shuffles the cards from their hand into their library, then draws that many cards.

Mountain

Chain Lightning

Chain Lightning deals 3 damage to any target. Then that player or that permanent's controller may pay {R}{R}. If the player does, they may copy this spell and may choose a new target for that copy.

Strip Mine

{T}: Add {C}.
{T}, Sacrifice Strip Mine: Destroy target land.

Island of Wak-Wak

{T}: Target creature with flying has base power 0 until end of turn.

Mox Emerald

City of Brass

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