Ragavan, Nimble Pilferer is so significant against these decks because they generally cannot interact with the monkey, which means it can start generating a lot of treasures and allows the fair deck to cast spells and progress the board while also holding up interaction like Counterspell or Archmages Charm for any potential broken plays
Here are the purposes of other cards included in the Melmetal build: Pokemon Communication, Poke Ball, and Professors Research: These cards help you draw a Skarmory in the early game, and also allow you to get the major pieces you need
It also needs to be able to enchant food
Those discarded Energy cards can then be reattached accordingly by playing Professor Sadas Vitality
Some players absolutely love this card and rank it in their top 5, while others dont even consider it
When it enters the battlefield, return a land you control to its owner's hand for strategic recycling