Someone else try using this card and see how often its effect fails to activate when I assume it should. For example, if gravekeepers spy is flipped face up, should you be able to negate that effect and equip that monster to this card?
i think i figured this out. enter a duel with an npc and check your settings. under Activation Confirmation, make sure under Chain that Self Chain ON is enabled, Auto for Activation Confirmation. it may just be expecting you to be tapping on the screen to use it.