Gruul Ragebeast

Whenever this creature or another creature you control enters, that creature fights target creature an opponent controls.

Verdant Haven

Enchant land
When this Aura enters, you gain 2 life.
Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color.

Primal Huntbeast

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Volcanic Geyser

Volcanic Geyser deals X damage to any target.

Ground Assault

Ground Assault deals damage to target creature equal to the number of lands you control.

Skinbrand Goblin

Bloodrush — {R}, Discard this card: Target attacking creature gets +2/+1 until end of turn.

Predator's Rapport

Choose target creature you control. You gain life equal to that creature's power plus its toughness.

Fire Elemental

Skarrg Guildmage

{R}{G}: Creatures you control gain trample until end of turn.
{1}{R}{G}: Target land you control becomes a 4/4 Elemental creature until end of turn. It's still a land.

Foundry Street Denizen

Whenever another red creature you control enters, this creature gets +1/+0 until end of turn.

Scab-Clan Charger

Bloodrush — {1}{G}, Discard this card: Target attacking creature gets +2/+4 until end of turn.

Gruul Guildgate

This land enters tapped.
{T}: Add {R} or {G}.

Ripscale Predator

Menace (This creature can't be blocked except by two or more creatures.)

Ghor-Clan Rampager

Trample
Bloodrush — {R}{G}, Discard this card: Target attacking creature gets +4/+4 and gains trample until end of turn.

Slaughterhorn

Bloodrush — {G}, Discard this card: Target attacking creature gets +3/+2 until end of turn.

Duskdale Wurm

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Ruination Wurm

Viashino Shanktail

First strike
Bloodrush — {2}{R}, Discard this card: Target attacking creature gets +3/+1 and gains first strike until end of turn.

Gruul Keyrune

{T}: Add {R} or {G}.
{R}{G}: This artifact becomes a 3/2 red and green Beast artifact creature with trample until end of turn.

Disciple of the Old Ways

{R}: This creature gains first strike until end of turn.

Mountain

Arbor Elf

Alpha Authority

Enchant creature
Enchanted creature has hexproof and can't be blocked by more than one creature.

Rubblehulk

Rubblehulk's power and toughness are each equal to the number of lands you control.
Bloodrush — {1}{R}{G}, Discard this card: Target attacking creature gets +X/+X until end of turn, where X is the number of lands you control.

Zhur-Taa Swine

Bloodrush — {1}{R}{G}, Discard this card: Target attacking creature gets +5/+4 until end of turn.

Forest

Ranger's Path

Search your library for up to two Forest cards, put them onto the battlefield tapped, then shuffle.

Pit Fight

Target creature you control fights another target creature. (Each deals damage equal to its power to the other.)