Once youâ€™ve discarded three cards, Hollow One costs to cast. It wonâ€™t stop at or cost negative amounts of mana.
Hollow Oneâ€™s first ability doesnâ€™t give you permission to discard cards. Youâ€™ll need another effect that instructs or allows you to discard them.
Hollow Oneâ€™s cost is reduced even if the cards youâ€™ve cycled or discarded arenâ€™t in your graveyard.
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