If an affected permanent changes controllers before its old controller's next untap step, this ability will prevent it from being untapped during its new controller's next untap step
A strong zombie commander does one of three things: it makes tokens to go wide, it recurs creatures from the graveyard so your board never stays cleared, or it turns a pile of dying zombies into card advantage and life drain
Let's say you have a Seaside Citadel that comes into play......the first Amulet of Vigor triggers, untapping the land....then you may tap that land for its mana before the second Amulet of Vigor triggers, which then untaps it again
this would be nutty if it could target your own thing
Regular players were very upset that their collections were being devalued in a serious way
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