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Banish all monsters on the field

2024-02-02 Unlike a face-down creature that was cast using a disguise or morph ability, a cloaked creature may still be turned face up after it loses its abilities if it's a creature card

Hidden Summoners

The downside is that this hits your cards as well as your opponents, but if you dont mind, then this card can play a huge role in making sure that your opponent is stuck without their main strategy

However, players were quick to agree with u/a-polos assessment

This gave the players who discovered the quasi-glitch in Magic Online a massive advantage by activating the Grim Monolith's companion abilities that do not untap in the untap phase