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When you encounter this phenomenon, open a Magic: The Gathering booster pack and shuffle it without looking at its contents. Those cards become the booster deck. You become the monarch. For the rest of the game, at the beginning of the monarch's end step, that player draws a card from the booster deck. They may spend mana of any type to cast those cards. (Then Planeswalk away from this phenomenon.)
Abilities, attacks, weakness & resistance
Other cards from Unknown Event
Royal Booster (PLA020) is a Phenomenon card from the Unknown Event set that triggers a special in-game effect when encountered. When encountered, it creates a separate booster deck by shuffling an unopened MTG booster pack unseen, grants the encountering player the monarch status, and lets that player draw from and cast cards from that booster using any color mana; then you planeswalk away from the phenomenon. This functions as a one-off, table/variant mechanic intended for casual or event play rather than normal deck construction.
Catalog pricing data as of 22 Apr 2026, 16:59
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