Sicuro
woe could kill serra in one turn... I admit, serras ability is a really good one, but with a tap effect like woes....serras got no chance...besides, you could easily enchant it with something like pasifism...then what happens?
ninja yeah but you can kill with a serra on the first turn:
swamp-->dark rit-->buried alive-->bury serra avatar, anger (gives haste to all creatures while in graveyard) and anything else you want-->fling the serra at yout oppnent and you win.
you cannot do that with any other avater i know. and hardly any other creature, save Phage of the top of my head
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simply because it's cool... 
