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Artifact
When Channeled Powerstone comes into play, add 1 to your mana pool.
Tap: return target artifact named Channeled Powerstone from your graveyard into play tapped.
If you don't use "wombat" in every sentence I will send my people after you.
When one brings back another, both end up being tapped.
As such, without some form of untap, a combo wouldn't work (although there may be such a card from the mirrodin set).
What this would be insane with is the old dross scorpion (if I remember its effect correctly) but then again, that requires playing dross scorpion.