The front half is fine and all, and it's nice that this is a transforming MDFC, so you can still access Green Goblin if you play Norman Osborn first
Etali, Primal Conqueror / Etali, Primal Sickness Etali, Primal Conqueror has a very similar ability to its counterpart Etali, Primal Storm, but what sets this one apart from the former is that you can use it as a Gruul commander thanks to its dual color identity

Here are two decklists I've won tournaments with a Red-White Aggro Burn deck and an Azorius Control deck, each with vast differences in the number of cards I played in their sideboards: Boros Burn | Modern | Roman Fusco, SCG IQ/1st Creatures (12) 4 Eidolon of the Great Revel 4 Monastery Swiftspear 4 Goblin Guide Instants (16) 4 Lightning Bolt 4 Lightning Helix 4 Boros Charm 3 Searing Blaze 1 Shard Volley Sorceries (12) 4 Rift Bolt 4 Skewer the Critics 4 Lava Spike Lands (20) 3 Mountain 4 Sunbaked Canyon 4 Inspiring Vantage 3 Bloodstained Mire 2 Scalding Tarn 2 Sacred Foundry 2 Fiery Islet Sideboard (15) 4 Smash to Smithereens 4 Skullcrack 3 Kor Firewalker 2 Path to Exile 2 Searing Blood With the Burn deck being a dedicated strategy of every card trying to deal three or more damage to my opponents, my sideboard options were very limited
Keep in mind that ESRBs T for Teen rating applies to the content of the card game itself, not the difficulty
He's in every game except the first, and so Wizards has made a Cid card with 15 different arts
Why it sold: resource stability, four-of staple energy, perfect week-one pickup