The upgrade is still too pricey IMO.
If you do the Math, the unupped version attacks for(x+1)/2 on average, where X is the number of consecutive hits.
E.G if you manage to make 5 consecutive attacks, your attack increased for 3 average. So you could have played a 3 Atk ccreature for same amount of Dmg.
For 2
quite balanced.
If compared with arsenic you have -2 base dmg and the easier to prevent dmg, but you can stack it, so it seems fair to me.
The upped version attacks for x+1 on average, so if you manage to hit twice you alerady have reached the point, where average dmg and
spent ae equal.
Also if you manage to hit 5 consecutive turns, thats 30 Dmg per Aeon. Take 2 of these + Titan and do 100 dmg in 5 turns. + 3 PA is a 5 turn win for 6
5
3
. Only counter being SoSac and screwed draws.
Overdrive is much more vulnerable since quint s more expensive + you weaken your creatures yourself.