Some internet speculation is Venture Into the Dungeon is a lesson like effect for dungeons that start in another zone, but if so I don't think it will be the side board, because otherwise this would make it useless in Commander and Brawl
The choice depends on your preference between print quality and market liquidity: Japanese Prints: Offer superior factory quality due to strict quality control, resulting in razor-sharp text, cleaner holographic clarity, and a lower counterfeit risk
This is the one lone card we've seen that references warped creatures
The Wind Crystal gives the discount of Pearl Medallion, with a lifegain doubler, and a late game way to jump the team and gain even more life
The Arena client lacks the infrastructure for fourplayer matches, and the card pool does not yet include the tens of thousands of cards legal in paper Commander