Expansion // Explosion (copy spell, or deal X draw X)
3U Chemister's Insight (draw 2, jump-start)
1UR Ionize (Counter, deal 2 dmg to controller)
1UU Sinister Sabotage (counter, surveil 1)
1R Lava Coil (Sorc - 4 dmg target creature)
UU Mission Briefing (surveil 2, then may cast inst/sorc from grave)

UB Thought Erasure (look at opp hand, choose nonland to discard)

3B Price of Fame (costs 2 less if target is legendary, destroy target creature, surveil 2)
2BB Ritual of Soot (Sorc, destroy all creatures CMC <=3)

UR Goblin Electromancer (2/2 inst/sorc cost 1 less)
UR League Guildmage (2/2 3UT, draw card; XRT, copy inst/sorc)

1UB Notion Rain (Sorc - surveil 2, draw 2, take 2 dmg)

3UR Hypothesizzle (draw 2, may discard to deal 4 to creature)

UR Firemind's Research (Ench - counters for inst/sorc, remove to 2 draw or 5 to deal 5 dmg)

UUURRR Niv-Mizzet, Parun (if we go izzet instead of grixis, maybe)