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This means exactly what it says: the only way to play Archen to your Bench is to play the Plume Fossil Item card

This is why many entries on any most expensive yugioh cards list arent playable staples, but one-time awards that were never meant to circulate

Also, it required lands to trigger it and without Life from the Loam, its not trivial to get those consistently

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Once per turn: You can send up to 2 LIGHT Machine monsters from your Deck to the GY, and if you do, for each monster sent to the GY, this card gains 1 additional attack during each Battle Phase this turn

Fourth, it is a very fatal weakness