Let's say we sacrifice k creatures, then necessarily k is somewhere between 0 and n (inclusive)
Every time a creature dies, it gains a charge counter, and then it pays you back at the start of your main phase with that much black mana
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Any enters-the-battlefield abilities of the copied artifact will trigger when the token enters the battlefield
We can do this with Collector Boosters as well, basing our calculations on the total potential value and the average value of a given slot
NPC difficulty isnt really consistent, even on the hardest setting, but and this is true of the Pokmon TCG in general its largely due to chance