"Why do I want these cards, if they only raise themselves? Why not an attack all skill? That's better after all"
No no no! You're so very mistaken.
Let's go back to the skill chart
Let's look at some of the cards in my deck.
So let's take Hermes skill bonus
attack: 19072 x 30% = 5722 skill bonus
And def: 18392 x 30% = 5499 skill bonus
The average person that is level 60 has a deck of each card being approximately 13000 atk & def.
13000 x 5 = 65000 total avg attack without boosts.
Valk's gods attack skill is 15% to all gods.
So let's say you have all god cards at around 13k average attack, that's 65000 avg attack x 15% boosts = 9750, but again you would have to have all god cards! Now before you get hasty and say that's still higher than it is with Hermes, I'll correct you.
Hermes boost is for attack and def! So if we added those two Hermes boost together 5722 + 5499 = 11221! Which beats Valkyrie. And more suitable most other SS RARE Evo bonuses with the single realm attack (or just defense) boost.
Now let's take another Evo SS RARE, but with an attack all boost. Nobunaga has attack boost all but only 10% for each card. 4max Nobu is at 13k, if u have 4 other cards around the same (totaling an average of 65000), it would be a 6500 bonus. But again this bonus is only in attack.
And thats trading with the hard line traders level 100 and up. Imagine what you can do if you're not in a hurry for your cards (like me who always wants instant gratification). I hope this helps you guys in your future by killing 2 birds with one stone and strengthening not only your attack, but also your defense. Trade smart people! Good Luck!
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Click Here for more information on HOW SKILL BOOSTS WORK