This highlights something very important. Their is a cost that a mere attack/quanta ratio misses. This cost is the cost to draw the card. (Skyironsword is also excluding the upgrade cost which is also significant.)
All the cards in that comparison were upgraded.
I did not say they weren't. However I have found that I get more accurate results when I compare upgraded cards by including the +1
- +2
cost they have relative to unupped cards. This also allows me to check between unupped and upgraded.
Shortsword is 3 attack / 1
+ 1 card
Longsword is 6 attack / 1
+ 1 card + 1 upgrade
Gavel is 7 attack / 2
+ 1 card + 1 upgrade + Specific Mark
I am not claiming you are wrong about Longsword. (Nor am I agreeing with you)