It might seem expensive to keep up with, especially for players who prefer formats with frequent card rotations like Standard and Alchemy, but doing well in MTG Arena without making big purchases isn't just possible -- it's easy
Its cheap to cast and doesnt cost anything to trigger, so its one of the rare older artifacts that can still pull its weight today
For example, beloved characters like Pikachu, Charizard and Gengar, are highly sought after and can therefore fetch higher prices
At this point Ive broken this rule in order to include nice proxied dual lands, but Ive maintained the $5 rule because it allows me to pick up a few new cards for the cube without having to spend a bunch of money on shipping for MPC proxies
Gisa and Geralf Gisa and Geralf combine their powers to become a zombie-engine that churns through the undead, continuously resurrecting them so you can retrigger abilities from cards like Accursed Marauder and Gray Merchant of Asphodel