Cathodion
Artifact Creature — Construct
When this creature dies, add 
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Instead of creating a tool that would be damaged by heat, the Thran built one that was charged by it.
Henry G. Higginbotham
Urza's Saga (USG)
• #287Rulings
The triggered ability isn't a mana ability. It uses the stack and can be responded to.
(wotc • 2011-01-25)
You get the mana whether you want it or not. If you don't spend it, it will disappear at the end of the current step (or phase).
(wotc • 2011-01-25)
The ability is never a mana ability.
(wotc • 2004-10-04)
Rulings
The triggered ability isn't a mana ability. It uses the stack and can be responded to.
(wotc • 2011-01-25)
You get the mana whether you want it or not. If you don't spend it, it will disappear at the end of the current step (or phase).
(wotc • 2011-01-25)
The ability is never a mana ability.
(wotc • 2004-10-04)