You can't pay that amount multiple times to multiply the effect
You can play Omnath as your commander or just throw it into your Commander deck, provided it has sufficient green mana sources
Each pack contains 1 art card, 1 full-art basic land, 6 connected commons or uncommons, 1 showcase or double-faced common/uncommon, 2 cards of any rarity (chance of showcase or double-faced), 1 rare or mythic rare (chance of showcase or double-faced), 1 foil of any rarity (chance of showcase or double-faced), 1 token/ad or special card from Magic's history
Some fans were thrilled but collectors with expensive cards from the early sets watched the price of their collections plummet on the secondary market
Since there are more paper Commander streams than ever before (thanks to SpellTable), there seems to be a new, unwritten power level coming into its own that shows up at a lot of these tables
Similarly, many decks built around set mechanics, like Mutate, Web-Slinging, or Earthbending, are fair game