Llanowar Elves

Tap to add green mana to your mana pool. This tap can be played as an interrupt.

Rootbound Crag

Ghalta, Primal Hunger

This spell costs {X} less to cast, where X is the total power of creatures you control. Trample

Skarrgan Hellkite

Riot (This creature enters the battlefield with your choice of a +1/+1 counter or haste.) Flying {3}{R}: Skarrgan Hellkite deals 2 damage divided as you choose among one or two targets. Activate this ability only if Skarrgan Hellkite has a +1/+1 counter on it.

Growth-Chamber Guardian

{2}{G}: Adapt 2. (If this creature has no +1/+1 counters on it, put two +1/+1 counters on it.) Whenever one or more +1/+1 counters are put on Growth-Chamber Guardian, you may search your library for a card named Growth-Chamber Guardian, reveal it, put it into your hand, then shuffle your library.

Cindervines

Whenever an opponent casts a noncreature spell, Cindervines deals 1 damage to that player. {1}, Sacrifice Cindervines: Destroy target artifact or enchantment. Cindervines deals 2 damage to that permanent's controller.

Domri, Chaos Bringer

+1: Add {R} or {G}. If that mana is spent on a creature spell, it gains riot. (It enters the battlefield with your choice of a +1/+1 counter or haste.) −3: Look at the top four cards of your library. You may reveal up to two creature cards from among them and put them into your hand. Put the rest on the bottom of your library in a random order. −8: You get an emblem with "At the beginning of each end step, create a 4/4 red and green Beast creature token with trample."

Gruul Spellbreaker

Riot (This creature enters the battlefield with your choice of a +1/+1 counter or haste.) Trample As long as it's your turn, you and Gruul Spellbreaker have hexproof.

Ravager Wurm

Riot (This creature enters the battlefield with your choice of a +1/+1 counter or haste.) When Ravager Wurm enters the battlefield, choose up to one — • Ravager Wurm fights target creature you don't control. • Destroy target land with an activated ability that isn't a mana ability.

Rhythm of the Wild

Creature spells you control can't be countered. Nontoken creatures you control have riot. (They enter the battlefield with your choice of a +1/+1 counter or haste.)

Sunder Shaman

Sunder Shaman can't be blocked by more than one creature. Whenever Sunder Shaman deals combat damage to a player, destroy target artifact or enchantment that player controls.

Zhur-Taa Goblin

Riot (This creature enters the battlefield with your choice of a +1/+1 counter or haste.)

Stomping Ground

({T}: Add {R} or {G}.) As Stomping Ground enters the battlefield, you may pay 2 life. If you don't, it enters the battlefield tapped.

Mountain

({T}: Add {R}.)