This card is broken in Pauper! Well, maybe not broken, but it is a ton of fun! If your opponent can't kill him quick, you can win on T4 easily. My favorite combos are some classic burns like Bolt and the new Distortion Strike.
Here is a video on YouTube I made:
http://www.youtube.com/watch?v=Wk0Td6_ZOmc
My opponent had a Last Gasp, but no black mana.
Posted By:
HERET1C
(6/21/2010 7:16:56 PM)
I think it does trigger if the spell is countered. You have to cast something for it to be countered in the first place, right?
Edit: I run this thing in my land destruction deck, and it is VICIOUS.
Posted By:
blindthrall
(7/2/2010 2:38:31 AM)
And then came Chandra's Spitfire. Of course, running both would be... hehehe...
Posted By:
WhiteyMcFly
(7/12/2010 2:16:53 PM)
If your opponent knows what he's doing, he won't let this guy stick around for more than one turn. Which is why I recommend Reckless Charge + Distortion Strike as soon as you cast him. 11 damage for 4 mana, and possibly more damage next turn. If you really want to be a tool, finish them off later by casting Cosmic Larva and flashing back the Reckless Charge.
Posted By:
achilleselbow
(7/24/2010 5:34:27 PM)
Here's a combo for Standard players.
Kiln Fiend + Distortion Strike + @ssault Strobe* + Bull Rush = Swing for 26 unblockable as early as turn three. I can't think of a more damaging combo that early in the game using only commons. o_o
Could it be... that Bull Rush is actually useful? Nah, it isn't really needed at all (obviously Brute Force is better, but it's not Standard legal), but it helps beat the game a turn earlier. Distortion Strike's Rebound effect will still seal the victory at turn 4.
*@ssault Strobe is a preview card in Scars in Mirrodin that grants target creature Double Strike for 
at Sorcery speed. Not as flexible as Double Cleave but it's still pretty handy, and cheaper.
Posted By:
Keiya
(9/23/2010 1:00:39 AM)
Distortion Strike was said many times, but it also works well with Soul's Fire. Overall great card that forces your opponent to "waste" a removal on a 2cmc creature.
Posted By:
S-R
(9/28/2010 1:22:35 AM)
Turn 1: Mountain
Turn 2: Mountain, Kiln Fiend.
Turn 3: Mountain, Bolt/Burst Lightning, Bolt/Burst Lightning (Eliminating potential blockers), Assault Strobe. Swing for 20.
Excellent for aggressive red decks in standard.
Posted By:
Removal
(10/17/2010 3:23:31 PM)
Brute Force works wonders with Kiln Fiend in a mono red burn/aggro deck.
Posted By:
GrimjawxRULES
(10/22/2010 3:25:09 AM)
Also I like the most recent comments about bull rush, reckless charge, distortion strike, etc.
So in case your worried about having your fiend removed or killed then just wait patiently in the corner till turn 5 when you could (w proper mana) play kiln fiend and use reckless charge, distortion strike, and assault strobe on him and instantly swing for 26 unblockable.
Posted By:
Leonidus7784
(11/11/2010 5:33:59 PM)
Put a berserk on him for extra madness
Posted By:
mlanier131
(1/4/2011 8:58:02 PM)