Anytime Umbris, or another Nightmare or Horror creature enters the battlefield under your control, you get to exile cards from the top of their deck until they hit a land card
(The context does beg the question, with tongue in cheek of course: was Lt
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They are primarily subdivided according to their frame color, into Normal Monsters, Effect Monsters, Fusion Monsters, Ritual Monsters, Synchro Monsters, Xyz Monsters, Pendulum Monsters, Link Monsters and Monster Tokens
When this creature leaves the battlefield, the exiled cards owner may cast that card without paying its mana cost
If you have prized or rare cards, consider top loaders or semi-rigid holders to keep them extra secure