Shrine of Limitless Power
Artifact
At the beginning of your upkeep or whenever you cast a black spell, put a charge counter on Shrine of Limitless Power.
, 
, Sacrifice Shrine of Limitless Power: Target player discards a card for each charge counter on Shrine of Limitless Power.
イラスト：
New Phyrexia#154アンコモン英語適正
裁定
2011年6月1日
Unlike most abilities that force a player to discard cards, this ability may be activated whenever you could cast an instant, including during your opponent’s draw step after they have drawn a card.
2011年6月1日
You can’t force an opponent to discard a card they cast by activating the last ability in response. The spell is on the stack by then.