In this case, all Energy cards and other effects remain with that Pokmon (unless you have to pay a retreat fee)
That alone will make this tough to answer with burn or attacks
If you choose the second mode for Heartless Act, you choose which counters to remove from the creature, no matter who controls the creature
The cost reduction also applies to card-draw spells like Reckless Impulse and Wrenn's Resolve, allowing you to churn through your library with startling speed
Casual Wizard decks arent all that popular any more, though, and I dont think Ive ever seen this card in play more than once or twice
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