As much as it pains me to say it, Sligh is dead. These decks have all evolved into Food Chain Goblins. [See Vegeta2711's excellent primer:
http://www.themanadrain.com/primers/fcg.htm]
If you insist on staying mono-red, though, I'd say for starters...
-4 Goblin Goon
-4 Skirk Prospector
-4 Goblin Recruiter
-4 Goblin Warchief
-1 Goblin Wizard
+4 Jackal Pup
+4 Goblin Cadets
+4 Fireblast
+3 Siege-Gang Commander
+1 Black Vise
+1 Chain Lightning
-4 Plateau
-4 Flooded Strand
+4 Wooded Foothills
+4 Bloodstained Mire