This + brain freeze + black lotus or lion's eye diamond + at least 6 cards in the graveyard is a kill. It doesn't take many cards so it could be fit into any shell that can make a little red mana (as a treat) and put cards in the yard.
If you have 24 or more cards in graveyard you can skip directly to step 3, and just cast lotus 6 times to increase storm count.
1.Cast lotus from yard, crack it, then brain freeze targeting yourself (Storm at 2 from casting Underworld Breach). You've netted 2 storm, 3 cards in your yard and 1 mana.
2.Now Lotus twice and cast brain freeze targetting yourself again (storm at 5), milling 18 cards and netting 4 mana.
3.Recast Lotus one last time (8 mana) and cast brain freeze targetting your opponent twice, (storm 7) for 24 cards, then again (storm 8 ) for 27 cards. You can even cast Brain Freeze in response to Brain Freeze storm trigger to increase storm count.