I have a question regarding engineered explosives, basically just want to make sure I understand the card correctly before I try and use it. If I use a U mana source it it comes in with 1 charge counter, and if I use UW it comes in with 2 charge counters ? Also I can cast it for 0 and kill non clone tokens ?
I have a question regarding engineered explosives, basically just want to make sure I understand the card correctly before I try and use it. If I use a U mana source it it comes in with 1 charge counter, and if I use UW it comes in with 2 charge counters ? Also I can cast it for 0 and kill non clone tokens ?
Yes, that's all correct. All that matters for the number of charge counters it puts on itself is how many of the five colors of mana you paid as a cost to cast it (no matter how much colorless mana you paid). As for tokens that aren't copies of cards, indeed, they have no mana cost defined, so their converted mana cost is 0, so activating an Explosives with 0 counters on it will destroy them.
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I'm a former judge (lapsed), who keeps up to date on rules and policy. Keep in mind that judges' answers aren't necessarily more valid than those of people who aren't judges; what matters is we can quote the rules to back up our answers. When in doubt, ask for such quotes.
What is relevant for the purposes of Engineered Explosives's sunburst is the number of colors of mana spent to cast Engineered Explosives (C.R. 702.43a). For example—
if U was spent to cast Engineered Explosives, that number is 1,
if WU was spent to cast Engineered Explosives, that number is 2,
if CCC was spent to cast Engineered Explosives, that number is 0, and
if no mana was spent to cast Engineered Explosives, that number is 0.
Engineered Explosives's second ability checks the number of charge counters on Engineered Explosives when that ability resolves (C.R. 608.2g), regardless of what mana, if any, was spent to cast Engineered Explosives.
Engineered Explosives