@bobhenry25
Rather than just voting you down like everyone else seems to be doing, I'll answer your question because the same thing bothered me when I first started playing.
The 0 toughness rule you are referring to is what is called a "State Based Effect" (or SBE) in MTG. While it may seem these effects happen instantly and cannot be stopped, they have their own timing regulations. In this case (and with many other 
-based creatures like many hydras) these come into play.
For one thing, SBE are only checked when the next player receives priority (can cast a spell or activate an ability). A player cannot respond (do something) to anything while a spell/ability is in the process of resolving. This ability, for example, doesn't finish resolving until the counters are placed (or he is sacrificed) and it triggers AS it comes into play. So there is never a time where this is a 0/0 creature AND on the battlefield when a player recei... (see all)
Posted By:
OmegaSerris
(1/23/2012 9:10:02 AM)
Wouldn't he die before you put the counters on him? Because when he hit the field then he will be checked, seen to have a toughness of 0 then killed, all before u put the counters on
Posted By:
bobhenry25
(9/25/2011 6:26:55 PM)
Use Doubling Season! Lol no one will ever guess its 12!
Posted By:
Nicol_Nocturnus
(1/25/2011 10:22:29 AM)
I've watched enough adult japanese animation to know where this is going...
It has a hidden ability: "if Six-y Beast is revealed with Induce Despair, the targeted creature gets -13/-13 intead and you may put Six-y Beast from your hand onto the battlefield."
Posted By:
Lash_of_Dragonbreath
(3/30/2012 5:57:45 PM)
To be a bad sport:
Think of any number. If your opponent guesses correctly, say that it's a different number.
Posted By:
Axelle
(9/1/2012 11:07:17 AM)
1 is useless, no-one would do that.
2 is bad.
3 is hill giant.
So we are left with splashable 4/4 for 4, 5/5 for 4, or 6/6 for 4.
Thats 2/3 to get a vanilla creature or 1/3 chance to waste time/mana.
Posted By:
TheWrathofShane
(7/9/2013 8:30:39 AM)
He wouldn't die because it's AS he enters the 'field, not WHEN.
Posted By:
NeoKoda
(10/30/2011 10:58:06 AM)
I usually pick 4. 4 CMC for 4/4 in red is definitely worth it, and people almost always go with 6 or, if they think they're being clever, 5.
Posted By:
LordRandomness
(11/22/2011 1:29:42 AM)
I'd guess one, because I know the people I play with.
Posted By:
DoragonShinzui
(5/22/2012 8:44:35 PM)
Flavor text should be 'Izzet six?'
3/5 Stars
Posted By:
Hunter06
(6/12/2013 11:32:30 AM)