[whi]Greyseer's Lair[/whi]


if i wanted to play 1 lair and another skaven card in one turn, would the just played lairs effect already count?
or would it have to wait for my next turn, beacause in this turn, my lair has already been the first skaven card, which would eat up its own ability until my next turn?

It's the latter. Greyseer's Lair is a Skaven card, so once it has been played, the next Skaven card that turn is not the first. And it can't reduce its own cost.