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For example, the most recent 25th anniversary sets are for example an amazing source of oldies but goodies you may want to consider

Fallout went for serialized Bobbleheads, and there wont need to be a lot of collectors who need the entire SPECIAL set of seven for these prices to be higher than expected

JAM Dragon Drive 1 PSY-Framelord Zeta 1 Mind Castlin 1 Hyper Psychic Riser 2 Silent Psychic Magician 1 P.U.N.K

#5 Mega Latias ex 181/132 Market Price: ~164.18 The legendary Eon Pokemon gets a Mega Evolution glow-up

Card from your Deck for example the new and powerful Counter Trap T.G

The rad counters can trigger the milling, but youre obviously going to want to include a lot of other ways to mill in your deck