I was sufficiently convinced and bought them
Having more cards means you have more options than the opponent, which usually wins the duel because you can do more things and if the opponent stops those things, that uses up their own cards and eventually they will run out, while you can keep playing
There were Borderless Hildebrandt cards
Whether youre manipulating enchantments to bring out more creatures or bringing cards back from the graveyard just to sacrifice them all over again, there are plenty of ways to keep your deck unique
Gallifrey Stands, an alternate wincon that requires all 13 Doctors in play, or, you know, changelings
During this era of Pokmon TCG , Shiny Pokmon were released as a Secret Rare subset of cards as Reverse Holos