Shrine of Limitless Power
Artifact
At the beginning of your upkeep and whenever you cast a black spell, put a charge counter on this artifact.
, 
, Sacrifice this artifact: Target player discards a card for each charge counter on this artifact.
Min Yum
New Phyrexia (NPH)
• #154Rulings
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.
(wotc • 2011-06-01)
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.
(wotc • 2011-06-01)
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Rulings
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.
(wotc • 2011-06-01)
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.
(wotc • 2011-06-01)