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There are a few other ways Wizards could balance this kind of mechanic besides a turn delay

Simply sacrifice Precursor Golem and one of the Golems it came with for four mana, Then pay four to activate Deathmantle, bringing Golem back

Of course, getting up to the 14 loyalty needed to use this ability will be incredibly difficult without ways to speed up the process (such as proliferating yourself), or with a big enough army to protect Karn from attackers for the two turns needed to set him off

It hits opposing Banishing Lights or Detention Spheres to free up our permanents, it kills off a wide range of creatures, and it gives us an answer to opposing Underworld Connections while were able to keep ours on board

Being able to cast the spell you exile for free as well as getting a Treasure is Value with a capital V