Last March of the Ents costs eight mana which is a big risk if it weren't uncounterable
-2 Fae of Wishes -4 Opt -4 Strategic Planning -2 Peer into the Abyss -2 Dig Through Time -6 Forest -3 Island -4 Yavimaya Coast -1 Blink of the Eye -1 Void Snare -1 Negate -1 Sweltering Suns -2 Wilt -2 Shifting Ceratops -2 Thought Distortion -1 Tormods Crypt +2 Voyaging Satyr +1 Lier, Disciple of the Drowned +4 Impulse +3 Bala Ged Recovery +2 Dark Petition +1 Behold the Beyond +3 Emergent Ultimatum +1 Ritual of Soot +3 Boseiju, Who Endures +1 Breeding Pool +4 Botanical Sanctum +2 Otawara, Soaring City +2 Pithing Needle +2 Narsets Reversal +1 Tear Asunder +1 Cyclonic Rift +1 Path of Peril +2 Supreme Verdict +2 Dragonlord Dromoka +1 Approach of the Second Sun +1 Zacama, Primal Calamity Total upgrade cost ~$360 Izzet Phoenix Izzet Phoenix is one of the most loved decks in Pioneer

If you do, return this card from your graveyard to your hand.) POWER/TOUGHNESS 0/0 ILLUSTRATOR Greg Hildebrandt LEGALITIES Standard Future Historic Timeless Gladiator Pioneer Modern Legacy Pauper Vintage Penny Commander Oathbreaker Standardbrawl Brawl Competitivebrawl Alchemy Paupercommander Duel Oldschool Premodern Predh Tlr LANGUAGES DE EN ES FR IT JP PT ZH-CN RULINGS 2018-12-07 Because damage remains marked on a creature until it's removed as the turn ends, nonlethal damage dealt to Golgari Grave-Troll may become lethal if you remove +1/+1 counters from it during that turn
Basically, relying on countermagic for protection usually means you are two turns slower to safely go off
This turns Fear of Missing Out into straight card advantage, and could potentially allow you to swing in for a ridiculous amount of damage