You can discard this card; add 1 Lair of Darkness from your Deck to your hand. You can Tribute 1 DARK monster; draw 1 card, or, if you Tributed a DARK monster other than this card to activate this effect, you can add 1 DARK monster with 2000 or more DEF from your Deck to your hand, instead. You can only use this effect of Ahrima, the Wicked Warden once per turn.