Krenko, Mob Boss

{T}: Create X 1/1 red Goblin creature tokens, where X is the number of Goblins you control.

Volcanic Geyser

Volcanic Geyser deals X damage to any target.

Krenko's Command

Create two 1/1 red Goblin creature tokens.

Mountain

Furnace Whelp

Flying
{R}: This creature gets +1/+0 until end of turn.

Evolving Wilds

{T}, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Cleaver Riot

Creatures you control gain double strike until end of turn. (They deal both first-strike and regular combat damage.)

Mogg Flunkies

This creature can't attack or block alone.

Trumpet Blast

Attacking creatures get +2/+0 until end of turn.

Titanic Growth

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

Kindled Fury

Target creature gets +1/+0 and gains first strike until end of turn. (It deals combat damage before creatures without first strike.)

Forest

Fire Elemental

Serpent's Gift

Target creature gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy it.)

Chandra's Fury

Chandra's Fury deals 4 damage to target player or planeswalker and 1 damage to each creature that player or that planeswalker's controller controls.

Arms Dealer

{1}{R}, Sacrifice a Goblin: This creature deals 4 damage to target creature.

Dragon Hatchling

Fervor

Creatures you control have haste. (They can attack and {T} as soon as they come under your control.)

Bladetusk Boar

Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)

Flinthoof Boar

This creature gets +1/+1 as long as you control a Mountain.
{R}: This creature gains haste until end of turn. (It can attack and {T} this turn.)

Flames of the Firebrand

Flames of the Firebrand deals 3 damage divided as you choose among one, two, or three targets.

Ring of Valkas

Equipped creature has haste. (It can attack and {T} no matter when it came under your control.)
At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's red.
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

Reckless Brute

Haste (This creature can attack and {T} as soon as it comes under your control.)
This creature attacks each combat if able.