Open chest mastery feedback

Hello.
im thinking about how cool this mastery is but there is lot of downsides that could be mitigated to make it even cooler.

currently this mastery is good only for strongboxes sadly and other few niche interactions

there are currently 2 major issues with this mastery

1st its caster mastery - this makes it unusable for lot of builds because simply they dont path to upper portions of tree where all caster masteries are located, another thing is even if you are located in int part of the tree there are still builds that simply dont take them, minions/dot builds for example. you need to kill 4-5 points to take not good passives in order to take it.

2nd its only for spells. i would like to take this mastery for attack builds but i simply cannot because i dont use spells

3rd minor issue is 25% chance, it happened lot to me, i played minion build, where i casted support spells, i took this mastery in order to open boxes for me, but i didnt have sockets to take some fast spell with faster casting, so i needed to cast my support spells manualy to open it and lot of times happened that i simply casted 9 spells in row without proc while running out of mana, it would be faster for me to just go and open those boxes.


proposed fixes to this issue:

1st make this a runegraf, im sure everyone has some notable allocated without mastery taken and one point for this mastery is good even without other changes.

2nd allow this also for attacks / minions

3rd either increase chance for this mastery to proc from 25% to 50%, for ppl who use spells with fast cast speed doesnt change anything while for others it would be better to use or make it static count(every 4th spell)/ implement bad luck protection(every 5th cast without proc would activate this mastery) this would limit the bad luck rng simply staying on one place casting spells adn thinking it would be faster to open manualy