Mirromancy is a blue/red intro pack focused on direct-damage "burn". The deck is Mirran-aligned.

“ Some Magic decks win the game with powerful creatures. Others, like the "Mirromancy" deck, win with powerful spells. Burn spells like Lava Axe and Red Sun's Zenith take fiery bites out of your opponent's life total, while cards like Quicksilver Geyser and Sleep give you the time you need to win.
Small utility creatures like Blisterstick Shaman and Neurok Commando deal with your opponents' creatures and stock your hand full of threats. Don't forget that even though your Neurok Commando can't be targeted, Rally the Forces still boosts its power, grants it first strike, and allows it to win its fair share of fights.

The key card in your deck is Galvanoth, a 3/3 creature that lets you cast instants and sorceries from the top of your library for free. Spells like Preordain and Foresee help to make sure that the top of your deck is the card that you'll need. Another creature, Fire Servant makes the burn spells you cast hit a lot harder. With Fire Servant on the table, Lava Axe deals a whopping 10 damage, and Arc Trail gets to deal 6 damage total.

The beauty of a deck like this is its flexibility, and it's easy to customize it. Are your opponents wielding decks full of annoying artifacts? Into the Core, an instant that exiles two artifacts, is a great answer. Are your opponents trying to swarm you with a creature rush? Slagstorm deals 3 damage to each creature on the battlefield for only three mana (or it can deal the last 3 damage to your opponent in a pinch). Finally, if the game is going long, Blue Sun's Zenith lets you draw as many cards as you have mana to pay—and shuffles right back into your deck so you can do it again later!