Even though a TCG collectible may feature a popular Pokmon, there are many rare valuable Pokmon cards that don't sell for a lot of money if they aren't a first print run
The discount which Gargos provides is significant, especially for Hydras with X in their mana cost, but Polukranos, Engine of Ruins ability to generate tokens also shouldnt be underestimated
The +2/+2 boost and hexproof from mono-colored spells make it tough to answer, and the more colors your creature has, the cheaper it is to equip
I decided to post pictures of this playset on the MagicTCG subreddit
Lets see some examples: Wax / Wane has two names: Wax and Wane. Its a green and white card with a mana value of 2
Equipped creature has "Whenever you gain life, this creature gets +X/+X until end of turn, where X is the amount of life you gained." Equip Equipped creature has "Whenever you gain life, this creature gets +X/+X until end of turn, where X is the amount of life you gained." Equip Artifact - Equipment Glamdring Equipped creature has first strike and gets +1/+0 for each instant and sorcery card in your graveyard
