The ability to lock the opponent out of the game (with a card tutored from your sideboard) for six mana is incredibly strong since it only takes a single sideboard slot in a deck that already runs Karn
Absolutely devastating for mono blue players and annoying for those of us who enjoy playing dual lands, Shock lands, and Triomes, Tsunami is ruthlessly efficient at what it does for 4 mana
Non-foil versions can also be found in Collector Boosters
That means I've put the lock on the game
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Card not found on the other hand doesnt really have enough Aetherborn around it to really make it worthwhile