Garbless, for example, takes advantage of the game's reliance on Item cards, while Trumbort deals more damage when the opponent has a lot of Trainer cards in their hand
Times have changed, the world and even MTG itself has moved on but (and this particularly applies if you were there from the beginning) having a no-nonsense, effective Angel that first made an appearance in the early 90s on the table can feel like nothing short of, well, magic.
Sometimes, a Monster would have too high of a defense to beat over, giving your opponent time to set up their plays
Additionally, you can boost Weaviles health with Giant Cape and Potions, while your trainers allow you to have a lot of control over the game by switching out yours or your opponents Pokmon
It cant compete with fast mana like Sol Ring, but fair decks rarely do much better