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Rebel Clash 144/192 Tranquill is a Stage 1 Card from the Pokemon set SWSH Rebel Clash
Look, Un-set mechanics like this that really affect the logistics of the game are unlikely to ever show up in a normal set, but given the odd legality of cards in Unfinity, you can, right now, play Attractions in Vintage, Legacy, and Commander
This means that decks can always have a backup attacker on board even if they have not committed to setting up any other energy yet, making this card one of the most important recovery cards in the current meta
(There are many reasons why this is so, but thats a topic for another time.) Once again, the number of cards to which this value disparity applies is far too large to go into further detail here
ManaBox allows you to access up to date market data from different stores and marketplaces so you always know the value of your cards or look at the prices of the cards you would like to get