If youre excited to try this out for yourself, Kaldheim is coming to MTG Arena (which can soon be found on Android phones as well as PC) on January 28th, followed by its tabletop release date on February 5th
Its cheap, efficient, and very effective
To me, the ability to sneak a permanent into play had far more value than reducing the cost of dragons by a single generic mana
Once it resolves, it will remain in effect until the game ends, Ride the Shoopuf's leaves the battlefield, or some subsequent effect changes its characteristics, whichever comes first
No one will ever pay full retail mana cost for this metal menace (though it doesnt HAVE Menace, dont get confused!) Instead, Krang makes for a valuable top end to come down fast for artifact decks looking to stack damage