Most often, power creep happens when designers want to incentivize players to purchase their latest set
This lets you bring out an Orcust Monster for Link plays, and makes Orcust Cymbal Skeleton one of the main targets for Orcust Monsters to send to the Graveyard
Pikachu, Umbreon, Mewtwo, and the original starter trio (Bulbasaur, Charmander, Squirtle evolutions) also command premiums
That said, there are times (especially just after rotation) when cards that are not that great are played just because of a lack of better options, and cards with a high potential that take time to find their potential
While its relatively rare to pull a valuable card, it can happen, and usually most sets have at least a handful or more of cards worth some money
The best part is that the deck is super cheap everywhere, coming in at just $42 in paper and with just 16 total rares and mythics (with half of the being eight dual lands) on Magic Arena