Please, please, please do not make those accesories. PLEASE.
They'll make arena completely an unenjoyable experience.
The arena right now might be flawed, but at least it's something that is done in 10 sec. I do 240 arena runs per week, if you increase the time it takes to win it's gonna affect me in a very negative way.
Stop trying to change the meta FOR THE WORSE, it will not open any new possibilities and those new possibilities that are opened will only replace these existing ones.
Just make them give 3% crit dmg and 1% crit, and the other -3,3% crit damage reduction when hit so that at the end they reduce your crit damage by -10% ie if you have 250 crit damage, your crit damage is reduced by 25.
That will make them much more fun and the tanky champs still get a small buff.

