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This mechanical niche has heretofore been a bit of a hidden gem, especially the idea of building around it but that seems to be changing now, and quickly

Each time your opponent Special Summons a monster(s) from any GY(s) or banishment, immediately draw 1 card

At the time of writing, TCGPlayer shows this card with an astounding estimated market price of $549.99 , making it the most valuable in the Pokmon TCG: Mega Evolution set.

being able to duplicate your spells while countering enemy spells makes it a prime target the moment it gets into play, but if it's built around correctly, it can be an unstoppable asset in any great deck

So next time you're pushing that giant cart through the aisles, keep an eye out