a hydra of course. even though dragons can fly, hydras have extra fire power.
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If all of the humans were on one side and would defeat one dragon and it would be in 2011 then the humans would win big time. We would just destroy him/her with bombs.
The elephant would win.
obviously army to army Persians would win by tactics but one to one a barbarian would win
raiden would win
Brock Leasnar would win
John cena would win in a fist fight an 50 cent would win in a in a gun fight