I'm lazy and don't feel like looking it up:

Does Mana Flare count as a triggered ability?
Does Mana Reflection count as a triggered ability?
Does Nykthos, Shrine to Nyx count as a triggered ability?

My gut tells me no, but if not I might try to build a wonky Strionic Resonator deck.

Mana Flare has a triggered mana ability which doesn't use the stack and can't be responded to.
Mana Reflection has a replacement effect.
Nykthos, Shrine to Nyx has two activated mana abilities, which don't use the stack and can't be responded to.

So no, none of these cards have abilities that can be targeted with Strionic Resonator's ability.

That's what I thought. thanks