A blue/red modern storm deck focused around extremely cheap cantrips and Blistercoil Weird/Paradise Mantle combo to practically produce "infinite" mana.
There are a few ways to generate a net gain of mana, primarily through Manamorphose Cerulean Wisps and Gitaxian Probe
Alternative win condition is making the weird simply big enough to one-shot them using Artful Dodge to grant it unblockable.
The deck is able to win as early as turn 2 if luck permits it
The dream hand: 1 Land (fetch or simply steam vents), Blistercoil Weird, Paradise Mantle, Gitaxian Probe, Gitaxian Probe, Faithless Looting,
Ideas Unbound
To explain why this is the dream hand: Turn 1, play Blistercoil. Turn 2, play Mantle (first spell cast for storm this turn), equip it, tap blister for blue mana and pay 2 life for probe, do that again, play Ideas Unbound.
At this or any point in the near future, if you drew any set of lands/blistercoils/Paradise Mantles/Dodge, simply discard them to looting, it fuels your graveyard nicely for the Visions of Beyond and due to the fact that you basically just drew 7 fresh new cards you should be able to start comboing from there until you've cast 19+ spells and can kill them with a single Grapeshot
Now, mulligan strategy. Since your deck is basically about ignoring 90% of the game going on around you and just finding your combo, the only important thing to have in your hand is a land. Just a single one. You ALMOST never want to keep a hand with 0 lands in it, as having just 1 land will enable serum visions, sleight of hand, faithless looting and alike, which will enable you to dig for your combo pieces. If your hand is something alike: Paradise Mantle, Blistercoil weird, Dispel, Gitaxian Probe, and other cantrips then you might be able to justify keeping the hand, as Gitaxian Probe basically lets you start with +1 card in your hand, and a peek at what the opponent is doing.