Gruul Ramp with Xenagos for Commander

Atla Palani creates 0/1 Egg tokens that can be sacrificed to potentially bring out powerful creatures like Ghalta, who can be summoned for free if its mana cost is reduced by the number of creatures you control. Since Ghalta's cost decreases with the number of creatures on the battlefield, using Atla helps to rapidly generate a board presence.

Fires of Yavimaya gives Scute Swarm haste, allowing it to attack immediately after it enters the battlefield. This can lead to explosive turns where multiple tokens can be created and swing for damage in a single turn, effectively overwhelming your opponent.

Chandra provides continuous damage and card advantage with her loyalty abilities, while Xenagos can ramp up mana and create creature tokens. Together, they create a strong battlefield presence where Chandra can deal damage, and Xenagos can help generate more creatures to support Chandra’s aggressive strategy.

Both Cultivate and Rampant Growth are excellent ramp cards that accelerate mana production. Cultivate allows you to search for two basic lands and put one into play, while Rampant Growth puts one directly onto the battlefield. This ramp strategy helps you power out large threats like Ghalta and other high-cost creatures more quickly.

Lightning Greaves can give Briar Hydra haste and shroud, protecting it from targeted removal while allowing it to attack immediately. This synergizes well with Briar Hydra's ability to enter the battlefield with a number of +1/+1 counters based on the mana spent, maximizing its impact on the game.