More game-changing errata might add or remove creatures types that Wizards wants better support for in the future
Multicolor Boros Charm Unflinching Courage Aurelia, the Warleader Ayli, Eternal Pilgrim Drogskol Reaver Halana and Alena, Partners Immersturm Predator Maelstrom Pulse Ovika, Enigma Goliath Prime Speaker Zegana Wilt-Leaf Liege Dreadwing Scavenger Fiendish Panda Perforating Artist Wardens of the Cycle Empyrean Eagle Heroic Reinforcements Ruby, Daring Tracker Tatyova, Benthic Druid Cloudblazer Deadly Brew Dryad Militant Enigma Drake Garna, Bloodfist of Keld Mortify Savage Ventmaw Teach by Example Trygon Predator Consuming Aberration Boros Charm and Unflinching Courage are in traditional foil
And of course, draw a card, because green needs more cards that do that
Based on this experimenation, it seems like the Sapphire/Steel deck is more aggressive , with new cards boosting Strength and increasing Resistance, while the Amber/Amethyst deck is more about mitigating and removing damage