Talruum Piper

All creatures with flying able to block this creature do so.

Keeper of Kookus

{R}: This creature gains protection from red until end of turn.

Flame Elemental

{R}, {T}, Sacrifice this creature: It deals damage equal to its power to target creature.

Fireblast

You may sacrifice two Mountains rather than pay this spell's mana cost.
Fireblast deals 4 damage to any target.

Song of Blood

Mill four cards. Whenever a creature attacks this turn, it gets +1/+0 until end of turn for each creature card put into your graveyard this way.

Goblin Tinkerer

{R}, {T}: Destroy target artifact. That artifact deals damage equal to its mana value to this creature.

Rock Slide

Rock Slide deals X damage divided as you choose among any number of target attacking or blocking creatures without flying.

Viashino Sandstalker

Haste (This creature can attack and {T} as soon as it comes under your control.)
At the beginning of the end step, return this creature to its owner's hand. (Return it only if it's on the battlefield.)

Goblin Swine-Rider

Whenever this creature becomes blocked, it deals 2 damage to each attacking creature and each blocking creature.

Goblin Elite Infantry

Whenever this creature blocks or becomes blocked, it gets -1/-1 until end of turn.

Mountain

Flare

Flare deals 1 damage to any target.
Draw a card at the beginning of the next turn's upkeep.

Ogre Enforcer

This creature can't be destroyed by lethal damage unless lethal damage dealt by a single source is marked on it.

Goblin Soothsayer

{R}, {T}, Sacrifice a Goblin: Red creatures get +1/+1 until end of turn.

Chaos Charm

Choose one —
• Destroy target Wall.
• Chaos Charm deals 1 damage to target creature.
• Target creature gains haste until end of turn.

Talruum Champion

First strike
Whenever this creature blocks or becomes blocked by a creature, that creature loses first strike until end of turn.

Kookus

Trample
At the beginning of your upkeep, if you don't control a creature named Keeper of Kookus, this creature deals 3 damage to you and attacks this turn if able.
{R}: This creature gets +1/+0 until end of turn.

Unerring Sling

{3}, {T}, Tap an untapped creature you control: This artifact deals damage equal to the tapped creature's power to target attacking or blocking creature with flying.

Goblin Scouts

Create three 1/1 red Goblin Scout creature tokens with mountainwalk. (They can't be blocked as long as defending player controls a Mountain.)

Mob Mentality

Enchant creature
Enchanted creature has trample.
Whenever all non-Wall creatures you control attack, enchanted creature gets +X/+0 until end of turn, where X is the number of attacking creatures.