Take part in events The easiest way to get Promo Cards is by participating in the games events
Just having Inti around means that it gets stronger each turn when attacking, and you have a baseline 2/2 that already attacks as a 3/3, not to mention synergies with unblockable creatures or big, fatty green creatures
For example, Liliana of the Veil isnt on this list, but youll see a very accurate Liliana forgery further down in this article
Fairy type Pokmon cards A short-lived type, Fairy type Pokmon cards were brought into the Pokmon TCG in the XY Kalos Starter Set in 2013, but the type was shelved with little explanation in 2020's set Sword and Shield
The problem here is the current environment for collecting in 2021, as smpratte mentioned, nowadays is just too volatile, speculators, hypedriven, etc