Of Planechase Anthology's 86 oversized cards, 8 are Phenomenon cards, and they behave completely differently from the 78 Plane cards they sit alongside in a planar deck.
Where a Plane card stays active until the group rolls a planeswalk symbol away from it, a Phenomenon fires once, immediately, and the group automatically moves past it right after.
All 8 Phenomenon cards in Anthology's pool trace back to Planechase 2012, since phenomena did not exist as a card type in the original 2009 Planechase release.
This guide covers how phenomena actually function at the table, walks through a couple of the most notable ones, and explains why they are worth including even though they only get one moment to matter.
When a player planeswalks into a Phenomenon card, its printed effect resolves immediately as a one-time event, rather than becoming an ongoing rules change like a Plane card would.
Right after that effect resolves, the group automatically planeswalks away from the Phenomenon and reveals the next card in the planar deck, meaning it never sits active waiting for a chaos roll.
Planechase 2012 introduced eight Phenomenon cards total: Chaotic Æther, Interplanar Tunnel, Morphic Tide, Mutual Epiphany, Planewide Disaster, Reality Shaping, Spatial Merging, and Time Distortion.
All eight carry over unchanged into Planechase Anthology's 86-card total, meaning every phenomenon ever printed for the format is included somewhere in this one box.
Planewide Disaster is a straightforward, high-impact phenomenon: when a player encounters it, all creatures across the entire table are destroyed at once, then the group planeswalks away from it.
That single moment can completely reset a multiplayer board state, making it one of the more memorable and consequential phenomena to actually hit the table during a game.
Deck construction rules cap any single planar deck at two different Phenomenon cards, since their one-time, disruptive nature would overwhelm a game if too many were stacked into one deck.
That cap keeps phenomena feeling like a rare, memorable surprise rather than a constant occurrence, preserving their impact each time one actually appears.
Because a phenomenon's effect applies to everyone simultaneously, it tends to reset an advantage one player has built up, which can be either welcomed or dreaded depending on who is currently ahead.
This makes phenomena a genuine equalizing force in longer multiplayer games, preventing any one player's early lead from simply compounding uninterrupted for the rest of the game.
Since a phenomenon only triggers when the planar deck happens to reveal it, there is no way to force its timing, which is part of what keeps its swing feeling earned rather than scripted.
Groups that enjoy that unpredictability tend to include both of their planar deck's two allowed phenomena, rather than just one, to increase the odds of seeing that swing moment in a given game.
Note also that a game can never actually start on a phenomenon; if the very first card revealed at the start of the game would be one, it is set aside until an actual plane is found instead. Keep that rule in mind before shuffling a planar deck heavy on phenomena for a new group, since it means the first card everyone actually sees will always be a normal plane.
Some playgroups deliberately build planar decks with zero phenomena for a more predictable, plane-only experience, while others treat the two-card maximum as a must-include for extra chaos.
Neither approach is wrong; it comes down to whether your group wants the added unpredictability of a one-time, table-wide swing built into the game. Sleeve your 60-card deck in matte card sleeves either way, since phenomena often coincide with a full board wipe.
Eight, all carried over from Planechase 2012.
Its effect resolves once immediately, then the group automatically moves on, unlike a Plane's ongoing effect.
It destroys all creatures at the table, then the group planeswalks away from it.
A maximum of two, and they cannot share a name.
Phenomena only get one moment at the table, but that moment can define an entire game. Store the set in a magnetic holder so the oversized cards stay flat between sessions.
If you have never seen Planewide Disaster wipe a crowded board, it is worth finding room for at least one phenomenon in your next planar deck.
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