UR delver

[Rass]

UR delver 60 cards, 15 sideboard 4 {Mountain} 3 {Steam Vents} 4 {Island} 4 {Scalding Tarn} 3 {Sulfur Falls} 2 {Misty Rainforest} 20 lands 4 {Young Pyromancer} 2 {Vendilion Clique} 1 {Pia and Kiran Nalaar} 4 {Snapcaster Mage} 4 {Delver of Secrets} 15 creatures 2 {Vapor Snag} 2 {Thought Scour} 1 {Electrolyze} 3 {Remand} 3 {Mana Leak} 2 {Spell Pierce} 4 {Serum Visions} 4 {Lightning Bolt} 4 {Gitaxian Probe} 25 other spells 1 {Engineered Explosives} 4 {Molten Rain} 1 {Pia and Kiran Nalaar} 1 {Spellskite} 2 {Vandalblast} 1 {Shattering Spree} 1 {Spell Pierce} 2 {Threads of Disloyalty} 1 {Dispel} 1 {Relic of Progenitus} Sideboard

[Rass]

Finishing this off. Debating on  {Ancestral Vision} but not sure I see the value in it for this build

[Spencer Addington]

You don't like thing in the ice?

[Mattao19]

TiTi is sweet.

Id add stomping ground and or breeding pool and add ancient grudge in your SB also helps your SB Eng. Exp.

4 molten rain seems excessive to me.