*nitpick*
This is a geometric worm, not an exponential one! The phrase "exponential" seems to be used by many without understanding what it means.
The Devour X means the hellion's size grows geometrically:
1 --> 1² = 1
2 --> 2² = 4
3 --> 3² = 9
4 --> 4² = 16
5 --> 5² = 25
A true exponential worm would grow as e^x, such as:
1 --> e^1 = 3 (rounded up always)
2 --> e^2 = 8
3 --> e^3 = 21
4 --> e^4 = 55
5 --> e^5 = 149
Also, longs for trampling and hasting...
*/nitpick*
Posted By:
Lord_of_Tresserhorn
(6/3/2012 4:36:10 PM)
We have Wormsign, Muad'Dib!
The most glaring absences on Thromok are Haste and Trample, but it's not as if 
doesn't have a way to give him those. Now, with that exponential growth and that-enchantment-that-doubles-counters, plus a swarm of tokens to munch on, you can get something huge. Why not add Pandemonium and Fling to the mix?
Posted By:
Trygon_Predator
(5/31/2012 8:33:24 PM)
"I'll play Thromok the Insatiable and attack you with the power of MATHEMATICS!"
Also, obligatory Doubling Season mention, just because.
Posted By:
SyntheticDreamer
(6/1/2012 5:56:06 PM)
Well this will get stupid fast.
Posted By:
Jayquaz
(5/31/2012 5:44:19 PM)
His planar deck is most disappointing. Adding in Grand Ossuary, Goldmeadow, and Immerstrum will be fun though.
Posted By:
orisiti
(6/3/2012 10:30:01 AM)
Add asceticism, and maybe an enchantment or two then watch as a single tear rolls down your opponents cheek before old Thromok devours their hopes. Mmmmmmm hope.
Posted By:
CraftedSteel
(6/3/2012 11:28:15 PM)
Otherwise known as ThrOMNOMNOMNOMNOMok the Insatiable.
Mmmmm, saprolings. Delicious.
Posted By:
Arachnos
(9/13/2012 9:15:49 PM)
@MANABURNWASGOOD
Actually, you spend five mana, sacrifice four creatures, and get a 16/16 with no further abilities. This guy is the exponential worm.
Posted By:
JackTheStripper
(6/1/2012 8:44:01 AM)
Eat all the creatures you just took with Insurrection in EDH.
Then feed him players.
Posted By:
gman92
(8/8/2012 11:22:50 PM)
Thunder-Thrash Elder costs 
less mana, it's bigger or almost equal if you devour 4 or less creatures, only has one colour, it's non-legendary and it's also cheaper. Nevertheless, it has 4 stars and this card has 4,5 stars. I don't understand you.
Posted By:
Scorium
(6/28/2012 1:07:06 PM)