[+1]: Each player discards a card. [–2]: Target player sacrifices a creature. [–6]: Separate all permanents target player controls into two piles. That player sacrifices all permanents in the pile of their choice.
2022-09-09
A pile can be empty. If the player chooses an empty pile, no permanents will be sacrificed.
2022-09-09
When Liliana's first ability resolves, first the player whose turn it is chooses a card in hand without revealing it, then each other player in turn order does the same. Then all the chosen cards are discarded at the same time.
2022-09-09
When Liliana's third ability resolves, you put each permanent the player controls into one of the two piles. For example, you could put a creature into one pile and an Aura enchanting that creature into the other pile.
2022-09-09
You can activate Liliana's first ability even if some or all players will be unable to discard a card.