We Bite

Named after the classic Misfit's song, We Bite was developed well before the vampire tribe became a thing in Magic. The goal was to make a War Elemental deck-and I thought that the best way to manage that was to have a bunch of smaller creatures, larger ones that create static sources of damage like Obsidian Fireheart (which I love SO MUCH), and effects like Seal of Fire that can be used in response to War Elemental's trigger.
 
Quick rules thing: With a Seal of Fire out, one can cast War Elemental, and when the check 'did an opponent take damage this turn' goes on the stack, one can use Seal's ability to do damage. If you wait to do that, the War Elemental will not only have its 'enter the battlefield' conditions satisfied, but you'll get to place two counters on it, too!

There's a subtheme of discard to help with that damage, using Kris Mage, Chain of Plasma (you only have to get Fiery Temper off once and nobody triggers it again) and Hazoret, with Stigma Lasher there to prevent the problem that any mono-red deck has: lifegain.

Let's see what we got!

2 Stigma Lasher
3 Kris Mage
4 War Elemental
2 Blood Knight
2 Mogg Fanatic
3 Obsidian Fireheart
4 Hazoret the Fervent

4 Seal of Fire

4 Chain of Plasma
4 Fiery Temper
4 Fireblast

2 Forgotten Cave
20 Mountain
2 Smoldering Crater