Cathodion
Artifact Creature — Construct
When this creature dies, add 
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Cathodions repair the Great Furnace by soldering parts of themselves to the mechanism. Eventually, they become one with the machine.
3/3
Illustrated by
Mirrodin#149UncommonEnglishLegality
Rulings
Oct 4, 2004
The ability is never a mana ability.
Jan 25, 2011
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).
Jan 25, 2011
The triggered ability isn't a mana ability. It uses the stack and can be responded to.