Would like to discuss about Unbound Avatar

Been trying to cook 3 elements Invoker.
While im Struggling a lot with defense, i have consider to play with +4elemental skill quarterstaff to boost Invocation.
The problem with Invocation its really mana hungry meta gem, sometimes i can lose 2k mana per use. Strong spell is Unbound avatar, which gives a lot energy generation and damage
I really would like to have at some point, direct from skill or interaction, that using Unbound avatar would give 25-50% energy to all meta gems on use, or give some skill cost discount. I Really would like to have some haste buff, not only raw damage on that skill