The problem with jade staff is that it's utterly obsoleted by shard of gratitude.
Weapons and shields are supposed to be fundamentally stronger than other permanents, because you're limited to just one of each (not counting flying weapon or crusader). The staff's healing is identical to SoG's healing (assuming you have a
mark), and it takes up the precious weapon slot, which could be used for other weapons, and not only does it take up that slot, it takes it up with a very poor hitting weapon.
To add even more insult,
has Sanctuary, which doesn't take up a weapon slot, heals for almost the same amount,
and protects your quanta and your hand. The staff is cheaper (2
vs. 4
), but this is almost irrelevant since you can only play 1 staff at a time (sans Flying Weapon).