It's cheap, harder to kill, and is never innately card advantage
Yes, you can technically get a removal spell from Insult // Injury or Prepare // Fight, but we haven't seen Roar of the Wurm- or Unburial Rites-type aftermath cards that could spawn an archetype
Audacious SwapAudacious Swap is a more expensive, worse Chaos WarpChaos Warp that you can do twice if you sacrifice a creature, but does say "cast" instead of "put onto the battlefield", and therefore allows you to try and get a couple bites at the apple
This page shows current market prices, recent eBay sales, PSA graded values, and price history for this Rare Holo card from Expedition Base Set
Each year we get hundreds of new cards and only about 10 planeswalkers
Generally you only pump the 4th through 7th mana into this when you have nothing better to cast (or bluff) meaning you don't feel to ripped off when they do kill it in response to a level up