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If I cast Perilous Research and I choose to sacrifice my Chromatic Star, can I sacrifice Chromatic Star and get one mana and also draw two cards?

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    Slight difference in that Perilous Research is an effect, not a cost, but the outcome is the same.
    – Samthere
    Commented Jan 18, 2018 at 13:24
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    It's close but not a duplicate, since the sacrifice for Research is not a cost. Research still works if you have no permanents to sacrifice (cast with black lotus mana for instance)
    – Andrew
    Commented Jan 18, 2018 at 13:49

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No.

Either:

  • You sacrifice Chromatic Star before Perilous Research resolves, in which case it's not there and you have to choose something else.
  • You sacrifice Chromatic Star as part of Perilous Research, in which case it's gone before you have the opportunity to activate its own ability.

However, you'll still draw the card from Chromatic Star's graveyard triggered ability, as it doesn't care how it got there.

This is because, in general, you can only activate abilities at certain times (when you have priority). When a spell is resolving, nobody gets priority until it's finished, so you can't activate the Chromatic Star during the decision to sacrifice it. That is, when a spell resolves, it has to finish completely before anyone can do other things.

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