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Weaker lands still tend to get more play than the more average or niche cube cards

They could have put those designations in again, but no, they made it easy on us for the Spider-Man sheet, designating all of the cards as mythic

Ramp : Ramp decks want to build enough mana to cast powerful cards that are too much for opponents to deal with

Your proliferate strategy gets a little self-replacing boost

So long as you have a land that produces more than one mana at a time, you can instantly generate infinite mana, though you then need something to put it into, like a Fireball for instance

Do you clean Pokemon cards before grading? Yes