LimitedThere Can Be Only One
Continuous Trap
Card text
Each player can only control 1 monster of each Type. If a player controls 2 or more monsters of the same Type, they must send some to the GY so they control no more than 1 monster of that Type.
- Property
- Continuous
Explained
A Continuous Trap. Each player can only control 1 monster of each Type. If a player controls 2 or more of the same Type, they send some to the GY until they have only 1.
Against decks that fill the board with one Type, as a 1-copy Trap since it's Limited in the TCG.
- Thinking Sets are blocked too. You can still Set or summon face-down.
How it works
Status: Limited in the TCG (Sept 21, 2026 list), so you can run 1 copy.
There Can Be Only One is a Continuous Trap. Each player can only control 1 monster of each Type. If a player controls 2 or more monsters of the same Type, they must send some to the GY so they control no more than 1 of that Type.
Rulings in plain English
Activation: Not in the Damage Step.
Not an activated effect: It applies while the card is face-up. Sending monsters doesn’t start a Chain, and they aren’t treated as sent by a card effect, so Trap protection doesn’t save them.
Summon lock: While a player has a face-up monster, they can’t Normal Summon, Flip Summon or Special Summon face-up a monster of the same Type. The same goes for putting a monster onto your opponent’s field. Normal Sets and face-down Special Summons are still allowed.
Later changes: If a flip or control change puts 2 of a Type on one field, the monster that arrived face-up later is sent. If several are flipped or summoned at once, some or all of those new monsters are sent.