3/3 for 2 sounds okay. However, King's Defender has never seen play (although that was at the time of an unnerfed Fiery War Axe ) (Kings Defender is a three mana weapon). Additionally, it is a two mana weapon that only has 3 attack, when you are suffering a drawback. Spirit Claws didn't see play either after it was upped to two mana, although the condition is more advantageous (a spell power minion) and not too difficult to meet. And to benfit of the attack buff you need to be overloaded three times and know in beforehand that you need to attack next turn.
All in all, I think the risk of having a 2 mana 1 attack weapon and other drawbacks is not outweighing the benefit of the potential 3/3 attack weapon for two mana. I voted bad.
Edit: Would be better if the indication that you will have overload next turn also counts for the buff.
This will help develop a new Even Shaman archetype using overload, Thunderhead, etc. It didn’t take off this meta because the other version is still seen as better. But the more overload even cards that are released, the more something could be put together.
This card plus zap makes early game removal a breeze.
I voted bad since you generally want to have an early game weapon to control the board and remove 2 & 3 drops like fiery war ax of old. But maybe this can see play in a more agressive shaman as a 2 mana 6 dmg over 2 turns with burn spells.