Be prepared to deal with numerous Fusion Monsters that, sometimes, can use your own monsters as material
These decks feature cards that are not legal for tournament play, either as reprints of non-GLC-legal cards (such as Charizard Base Set) or new cards that are not legal for tournament play (such as Ho-oh ex)
Printing them in your house definitely won't give you good results unless you use high quality paper and a hella good printer, and most printers aren't compatible with such thick paper
Market Oversupply When the Pokemon Company prints large quantities of a set, or when a special product makes specific cards widely available, prices drop due to increased supply
As of Sept 2025, MTG has about 146 premier/core sets
You can't cast Victimize targeting only one creature card