A better card for evasion in Izzet Blitz is [[Apostle’s Blessing]], because it costs just one colorless mana, can both work as evasion (by giving your dude pro-opponent-color) and protection (by giving it pro-color-of-removal). You sometimes play one shadowrift, because that cantrips and gives evasion. But the blessings are what you run 3-of usually. So I think your list could do something similar for your Delvers to help them go through and alternatively protect your Alchemists, because you face very similar problems. They are rarely dead cards, unlike pure evasion cards, when you only have an alchemist and some lookout out and don’t plan on attacking but face removal.

A better card for evasion in Izzet Blitz is [[Apostle’s Blessing]], because it costs just one colorless mana, can both work as evasion (by giving your dude pro-opponent-color) and protection (by giving it pro-color-of-removal). You sometimes play one shadowrift, because that cantrips and gives evasion. But the blessings are what you run 3-of usually. So I think your list could do something similar for your Delvers to help them go through and alternatively protect your Alchemists, because you face very similar problems. They are rarely dead cards, unlike pure evasion cards, when you only have an alchemist and some lookout out and don’t plan on attacking but face removal.

Will Magma Jet really be that great for UR Delver? Sure, “deal 2, scry 2” sounds nice, but Delver mostly wants the burn for removal, and 2 damage isn’t that great in a format where you reagularily face 1/3 (Seagate Oracle, Elusive Spellfist and in future Augur of Bolas) and 2/3 (Kor Skyfisher) and even bigger stuff. I think Delver really wants to run stuff that deals 3 and up. Sure, Magma Jet could become maybe a 1/2-of to replace some Preordain maybe, to open up the burn aspect a bit more while keeping up draw quality.

Thunderous Wrath on the other hand could really be something to play as a 1/2-of just on the off-chance you can get rid of an Angler or just burn 5 to the face as a finisher.

Will Magma Jet really be that great for UR Delver? Sure, “deal 2, scry 2” sounds nice, but Delver mostly wants the burn for removal, and 2 damage isn’t that great in a format where you reagularily face 1/3 (Seagate Oracle, Elusive Spellfist and in future Augur of Bolas) and 2/3 (Kor Skyfisher) and even bigger stuff. I think Delver really wants to run stuff that deals 3 and up. Sure, Magma Jet could become maybe a 1/2-of to replace some Preordain maybe, to open up the burn aspect a bit more while keeping up draw quality.

Thunderous Wrath on the other hand could really be something to play as a 1/2-of just on the off-chance you can get rid of an Angler or just burn 5 to the face as a finisher.