Gold costs for ability

Hi,
i would like to know if there is any way to make a no target dummy ability which costs gold, instead of mana. I tried with 'Andt' (the one u can scout map from neutral goblin lab), but it is point target.
I really wouldnt like to do 10000 dummy units for many levelable upgrades.
The way i currently do it is by giving a unit revive hero ability and change the gameplay constants of revive cost, but well.... sucks even more.
So is there a way to make 'Andt' no target or anything else?

charge lumber and gold ability perhaps?

Thanks
Thought there was an ability, but i wasnt sure and didnt find it :/

Reveal is the only ability I know of that cost's gold/lumber

-Av3n

Destroyer Form? Although that's kinda the same as buying units..

More like unit/bulding upgrade.

I meant the same as in he'd still need like X units for the gold costs.

I suggest reveal, because Charge Gold/Lumber is bugged, it won't do anything with triggers

Reveal has a target icon so it wont work for me.
Charge gold is fine till now, what bugs do you mean?

Triggers work with Charge Gold and Lumber fine for me...