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Fyndhorn Elves, Joraga Treespeaker, Elvish Mystic, Llanowar Elves - one drop mana dorks. Fast, reliable mana producers, synergizes with Priest of Titania.
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Arbor Elf - this elf is not just a 1 mana producer, but much more, because the deck runs Wild Growth and Utopia Sprawl
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Argothian Elder - pretty good untapper, can be as useful (or even better with Gaea's Cradle, and Nykthos, Shrine to Nyx) in this matter as Arbor Elf, and it is one of the key combo pieces of infinite mana combos
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Avenger of Zendikar - fantastic creature, it has huge amount of synergies in the deck. He can be a finisher in aggro strategy of the deck and the best way to end the game with him is to cast Tooth and Nail and to drop him with Craterhoof Behemoth. He can provide insane acceleration with Gaea's Cradle and ridiculous amount of extra card draw with Regal Force.
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Caustic Caterpillar - very fast spot removal. But the most valuable feature is that it can destroy targets on instant speed.
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Oracle of Mul Daya - this fantastic creature gives us an extra lands every turn, which means that we can start the game with a lot of lands and explosively win, or drop a lot of lands in late game by drawing a lot of cards. Additionally, Oracle provide an interesting form of card advantage and top deck control.
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Bane of Progress - this one is a good enchantments/artifacts mass removal, and after he gets bigger by eating those permanents he can "turn on" Rhonas for blocking and attacking, or can be used by all the spells which are intended for Rhonas (card draw-, mana- depending on power, or creature removals).
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Craterhoof Behemoth - famous green monster, who usually is used for ending the game with combat damage with a one brutal swing. He actually synergizes with other cards: Selvala, Heart of the Wilds/Devoted Druid - Huge amount of mana will be produced. Greater Good/Life's Legacy/Garruk, Primal Hunter/Momentous Fall - insane card draw.
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Devoted Druid - pretty good and fast mana dork, have a very strong synergy with Craterhoof Behemoth
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Elvish Archdruid - another Priest of Titania in the deck, another elf, another combo piece for infinite mana, another high-intensity devotion creature. SWEET!
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Eternal Witness- staple in any green deck. Along with the fact that this card is good in itself as recursion spell, it can provide infinite casts from graveyard with infinite mana with Cloudstone Curio and can bring back initial spells in the hand after resolution for recast (Protean Hulk, Tooth and Nail, Chord of Calling, Genesis Wave, Green Sun's Zenith etc...) if it is necessary.
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Fauna Shaman - repeatable creature tutor. Can be used twice a turn with Quirion Ranger, Wirewood Symbiote, Wirewood Lodge. It is just so awesome.
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Karametra's Acolyte - it is a combo piece of infinite mana combo and a very good dork for tons of extra mana, especially considering very high devotion in this deck
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Manglehorn - It is impossible to overestimate this creature. It is a decent artifact spot removal and asymmetrical stax effect in one body. All fast and powerful decks usually run a lot of good and fast mana rocks, so this creature will not just destroy one (or more) artifact, it will additionally slow down those decks. It is especially effective against cards like Grim Monolith, Mana Vault, and Basalt Monolith in their hand. And it is very important to mention that Manglehorn shuts down the famous combo - Basalt Monolith + Rings of Brighthearth + Sensei's Divining Top
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Priest of Titania - very powerful mana producer, can be used for making infinite mana with Umbral Mantle and three other elves. For this goal the deck runs a lot of elves. One of the best ways to assemble it is to crack Protean Hulk, and when it goes to the GY you put Priest of Titania and up to 4 other 1 cmc elves on the battlefield.
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Protean Hulk - this one is broken as hell. Pretty often I see that green decks avoid to use Hulk, because they often lack of sac outlets to kill him. But this deck runs a lot of ways to do that. Sac him with Greater Good, Life's Legacy, Natural Order or Momentous Fall. Kill him with Beast Within or with Rhonas using spells like: Ulvenwald Tracker, Viridian Longbow. He brings a real disaster on the battlefield. My favorite is to sac him with Greater Good right before my turn.
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Quirion Ranger - with all the dorks and land untappers this guy can make insane amount of mana. Favorite targets are - Arbor Elf, Argothian Elder, Devoted Druid, Priest of Titania, Selvala, Heart of the Wilds, and Karametra's Acolyte, Another way of use it is to bounce Dryad Arbor for blocking enemy creatures.
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Reclamation Sage - just a very good enchantment/artifact removal, great with Wirewood Symbiote and Cloudstone Curio
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Regal Force - this one is one of my favorite green creatures, it can create insane synergies for drawing tons of cards, and it "turns on" Rhonas. Insanely good with Avenger of Zendikar.
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Selvala, Heart of the Wilds - this card by itself is a monster, it gives a lot of mana and card draw, but often people avoid to use her, because she can give extra cards to opponents. But it won’t happen in Rhonas deck. From the start of the game you will always be the person with the most powerful creatures, because Rhonas ETB on turn 2 almost always. In this deck Selvala is a shining diamond, cuz if you put her on the battlefield on turn 3 without haste, you will have all the chances to end the game on turn 4-5. Selvala, Heart of the Wilds + Umbral Mantle - creates an infinite mana combo with any creature with power 5 or more, and Rhonas has exactly 5 power and the ability to kill everyone with infinite mana.
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Terastodon - Super powerful creature in this deck because his stats bring benefit from power dependent spells in this deck and his ability to destroy 3 noncreature permanents is insane! One of the best targets to cheat in the battlefield for Natural Order, usually if we drop it on turn 3-4 - it is a GG, very often people just concede seeing this happened.
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Ulamog, the Infinite Gyre - Super powerful finisher with indestructible and uncounterable spot removal in one body. It can circumvent some really powerful stax cards like Contamination, Infernal Darkness, Humility, Iona, Shield of Emeria and others. Its annihilator ability is a death sentence when he attacks. One of the best ways to cheat him directly in to the battlefield is Pattern of Rebirth or epic cast with Genesis Wave. It has a very strong synergy with Survival of the Fittest, Fauna Shaman (graveyard recursion) and with Greater Good.
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Ulvenwald Tracker - one of the secret tech of Rhonas creature killing. When this guy and Rhonas are on the battlefield we able to kill one creature per round on instant speed.
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Viridian Zealot - very good removal, additionally it is an elf and it has in its mana cost, which make him even better with Nykthos, Shrine to Nyx
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Vorinclex, Voice of Hunger - brings the necessary element of mana denial/double for the aggro strategy of the deck. It is insanely good with cards like Winter Orb, Genesis Wave, Argothian Elder
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Wirewood Symbiote - any untapper is a beast in this deck. And if this untapper can help to save our elves bouncing them into our hand, it is even better.