Izzet Spellementals wants to chain cheap spells uninterrupted to grow Hearth Elemental and Eddymurk Crab while using Spell Snare and Get Out for protection; none of our sideboard removal is useful since their real threats are mana value 6+ on the battlefield. Surrak, Elusive Hunter can't be countered, dodging Spell Snare, and pressures them with trample before their expensive payoffs come online. Esper Origins is too slow for this race, so it's swapped for a faster, protected threat; Torpor Orb is left in the board since it wouldn't stop the bulk of their value (cantrips and instants, not ETBs).