Classic stompy list, with a focus on boosting counters with Oran-Rief Ooze that rewards you for going wide. The usual opening will consist of Llanowar Elves or a Pelt Collector that grows as you curve out into creatures like Stonecoil Serpent and Steel Leaf Champion. If you have a Llanowar Elves, a Pelt Collector, and a 2-drop in hand, it's best to play the Elves first and sequence the Collector and 2-drop on turn 2. There's no ideal curve or 1-drop, as any combination of your early game creatures in quick succession can be devastating - either a clean sweep of Pelt Collector and 2, 3 and 4 power creatures; or a Llanowar Elves straight into Yorvo, Lord of Garenbrig or Steel Leaf Champion.
Rhonas the Indomitable is hard to kill and makes trading against other midrange decks easier. Scavenging Ooze in the mainboard is a great on-curve creature, and deletes Uro, Titan of Nature's Wrath from the yard. The Great Henge powers you through your deck towards the end, and Yorvo, Lord of Garenbrig swells in size as you go wide, making your 1-drops effective even in the late game with him on board. Vivien, Arkbow Ranger pumps your creatures and lets you fish for a finisher from your sideboard such as End-Raze Forerunners, or some flexible removal like Meteor Golem. Stonecoil Serpent is one of the most flexible cards in this deck, and is literally ALWAYS on curve - it's not even necessarily a bad idea to play it on turn one if you have, for example, a Barkhide Troll and Oran-Rief Ooze in hand. The best mutate targets for Gemrazer are Yorvo, Lord of Garenbrig and Stonecoil Serpent, as their counters will massively add to Gemrazer's power if it is placed on top. Removal includes a 1-of Inscription of Abundance and Ram Through - the inscription gives you some versatility for combat tricks and lifegain, but there is an extra copy of each in the sideboard depending on what performs better in your meta - Vivien, Arkbow Ranger also gives you some extra removal if you're in a pinch, which is why we run so few copies of Ram Through.
Sideboard
Besides the Vivien wishboard creatures such as Craterhoof Behemoth and Ghalta, Primal Hunger, the sideboard contains extra graveyard hate for Uro, Titan of Nature's Wrath and Aristocrats decks in the form of Grafdigger's Cage, more copies of your removal for creature-based decks, and board wipe insurance in the form of The Ozolith and Heroic Intervention (I run one of each, but depending on how they perform one could be cut for an extra copy of the other).
Against control, you will want to side in Vivien Reid for adding value in the late-game, in the place of one copy of Oran-Rief Ooze. If against pesky counter-heavy blue, swap out a Llanowar Elves and a Pelt Collector for both copies of Allosaurus Shepherd (which is also a great finisher), and consider swapping a Questing Beast for a Shifting Ceratops as well. You also might want to take out Inscription of Abundance and Ram Through for The Ozolith and Heroic Intervention if you find your creatures are getting blown up a little too much. If you want to keep an Inscription, you can side out a creature such as Yorvo, Lord of Garenbrig instead.
Against midrange or aggro, bring in your extra copies of Ram Through and Inscription of Abundance. You can even take out a Questing Beast for an Elder Gargaroth if Gargaroth is likely to make an impact in the matchup. Vivien, Arkbow Ranger excels in creature-based matchups, so don't consider taking her out. Barkhide Troll is also a fantastic blocker against weenie decks, so should stay in, as should Scavenging Ooze for lifegain. To make space for the removal, consider taking out a Llanowar Elves and an Oran-Rief Ooze.
Some creatures, like Craterhoof Behemoth, Elder Gargaroth, End-Raze Forerunners, Ghalta, Primal Hunger and Meteor Golem are best used to fish for with Vivien, Arkbow Ranger whenever they are most needed, and you are unlikely to want to side them into the mainboard between matches.
