For each player, they can put their abilities on the stack in the order of their choice

Advanced Search Sets Random Syntax Arcane Proxy Ashad, the Lone Cyberman Assembly Hall Assimilation Aegis Auton Soldier Battlemage's Bracers Blade of Selves Blade of Shared Souls Bloodforged Battle-Axe Blue Mage's Cane Blue Ribbon Brass Knuckles Brudiclad, Telchor Engineer Curie, Emergent Intelligence Cursecloth Wrappings Cursed Mirror Cybermen Squadron Dalek Squadron Dermotaxi Dino DNA Dinosaur Headdress Dollhouse of Horrors Duplication Device Dutiful Replicator Echo Chamber Esika's Chariot Exterminator Magmarch Gallery of Legends Gallery of Legends God-Pharaoh's Gift Hall of Mirrors Helm of the Host Hulking Metamorph Illusionist's Bracers Imposter Mech Improvised Arsenal Killer Cosplay Machine God's Effigy Mimic Vat Mindlink Mech Minion Reflector Mirage Mirror Mirror of the Forebears Mishra's Self-Replicator Myr Propagator Nexus of Becoming Phoenix Fleet Airship Phyrexian Metamorph Phyrexian Triniform Precursor Golem Reflective Golem Rimefire Torque Roving Actuator Sorcerer's Broom Soul Foundry Soul Separator Soundwave, Sonic Spy Spellbinder Sword of Wealth and Power Synth Infiltrator The Animus The Fire Crystal Trickster's Talisman Ultron, Artificial Malevolence Worldwalker Helm

To add it, we removed Commence the Endgame
Priest of Titania is a classic mana dork that taps for green mana equal to the number of elves you control, which means that you can make a ton of mana while doing what your commander already wants you to do
A mono-Green version that tries to pair landfall creatures with Awaken the Woods, a Gruul version that uses Worldsoul's Rage, a graveyard version that uses Aftermath Analyst and Lumra, Bellow of the Woods, and a Chocobo-based version built around Choco, Seeker of Paradise
It also lacks any evasion, meaning that big 9/9 horror can be easily blocked by a 1/1 squirrel token