Arlinn, The Packs Hope is a Double-Face planeswalker card in which her loyalty abilities are different depending on whether its day or night
That fits into the flavor of green, whose hostility to artifice justifies its near infinite ways to destroy artifacts

Aerial Extortionist Angelic Gift Angelic Sell-Sword Armed with Proof Case of the Pilfered Proof Cast Out Chosen by Heliod Curse of Silence Dawn of a New Age Detention Chariot Eagle of Deliverance Elspeth Conquers Death Errand-Rider of Gondor Farsight Adept Form of the Approach of the Second Sun Four Knocks Glimmer Lens Inspiring Commander Inspiring Overseer Invasion of Dominaria Loran of the Third Path Mentor of the Meek Nick Fury, Spymaster Novice Inspector Orator of Ojutai Origin of the Avengers Ox Drover Pentarch Ward Potion of Healing Priest of Ancient Lore Primary Research Professor of Symbology Puresteel Paladin Raffine's Informant Resistance Squad Roving Harper Rumor Gatherer Rune of Sustenance Sage's Reverie Sanctuary Warden Search Party Captain Serene Sleuth Settlement Blacksmith Sigarda's Splendor Slayer's Bounty Spark Rupture Sparring Regimen Spirited Companion Splinter, Aging Champion Stack of Paperwork (playtest) Staff of the Storyteller Stalwarts of Osgiliath Tale of Tinviel Teyo, Geometric Tactician The Night of the Doctor The Princess Takes Flight The Restoration of Eiganjo Thraben Inspector Trial of a Time Lord Unquestioned Authority Vault 101: Birthday Party Wall of Omens Wedding Ring Woodland Acolyte

This was one of the very first ideas for the set, even before we had illustrations, and it came from our creative director, Jess Lanzillo
Chicken la King Aside from its witty reminder text, theres nothing holding Chicken la King back from Eternal format play
Convoke can help them catch foes off guard and Chrome Host Seedshark intrigues me and works quite well with the convoke spells, but I think those options end up fitting better in a deck more dedicated to that kind of strategy