How bout unupped starts with 3 attack and upped starts with 5
That's a nice start, but I have a feeling that a card like this can potentially make
one of the most hated elements in game. If this card was paired up with an Otyugh on the field and given immortality via Quintessence, then no creature would be safe unless they had both massive amounts of HP AND attack.
Also - for your card description:
"Duel: if the target creature has a lower attack, kill it, and gain 1+|1+."
...needs to match the card; editing the parts in red, you get:
"
Duel: if the target creature has lower attack, kill it, and gain 1+|1+."
That said, Ares is the God of War. Challenging a single creature on the field to potentially gain +1|+1 feels a little bit... 'un-warlike'. Why not give it a very low HP for both the non-upgraded and upgraded forms, while increasing its attack, and giving it an ability where it 'challenges' ALL creatures on the opposing field? If it's strong enough, it can take on multiple creatures, but otherwise, it could end up killing itself in the process.
Just a suggestion, of course.
Oh, and be careful about the image you chose: the page,
http://connect.in.com/ares-v/photos-1-1-1-2dd6008983928ed71401e07366d65d84.html , indicates in the bottom right corner that it may be subject to copyright, but I'm not sure if it's still royalty free (I keep on getting links to websites in French, which worries me).
