Mono-Red Gobby Stomp
 
4 Mogg Flunkies
4 Goblin Patrol
4 Mogg Fanatic
4 Ball Lightning (uncommon from the Dark)
4 Goblin Grenade
4 FireBlast
4 lightning bolt
4 chain lightning
4 incinerate
4 flamerift
20 mountains
 
If Ball Lightning is ruled as a rare, then the deck changes somewhat.  I'd probably toss in 4 jackle pups in their place.
 
Mono-blue
 
4 ophidian
4 man'o'war
4 counterspell
4 powersink
3 rewind
4 spiketail hatchling
4 Suq'a'ta Firewalker (pinger immune to red will stop most of the goblins and kills ball lightning, jackle pups etc.)
3 capsize
4 impulse
2 zuran spell caster
4 daze
20 islands