“Palantir mills (or attempts) blightsteel. Does the opp life loss include the mana value of BSC or no? Can the game use the revealed BSC to get Last Known Info for the Palantir ability? or no because does BSC doesnt leave library?”
“Reading 701.17c–d, I’m not seeing how the game would get info from that card. It’s not LKI; the card never changes zones. The reveal shouldn’t matter. That’s just so you can prove it really was a DC. Rules team agrees with me: No life loss for DC.”
- Matt Tabak (source)