Waste Management Operations, no cards in the library and in the hand

How it works? Do you immediately draw card you have put into your library using WMO? I'm asking because per rulebook you are drawing cards after you are playing them and this "window" already seems to pass.

elotar wrote:

How it works? Do you immediately draw card you have put into your library using WMO? I'm asking because per rulebook you are drawing cards after you are playing them and this "window" already seems to pass.

Yes, WMO would place the cards in your library, and immediately as that happens you have to draw up to match your hand size.

Ruling supporting the above:
[LSJ 20030512] (specific to WMO)
[LSJ 20000321] (that you draw up when cards are put into empty library if not at hand size)
[LSJ 20080208] (that one continuously look to replace/draw up cards at the first opportunity when not at hand size)

Rulebook:
Drawing Cards

Whenever you play a card from your hand, you draw another from your library to replace it (unless card text says otherwise). If your library is empty, then you do not draw to replenish your hand, but you do continue to play. The number of cards in your hand should always match your hand size (cards that are replaced later reduce your hand size for the duration of the effect). The starting default hand size is seven cards in hand. Whenever an effect changes your hand size or adds or removes cards from your hand, immediately discard down to or draw up to match your hand size.

Thanks