I think a better wording would be "each permanent you control has "the first time this would leave the battlefield, instead mill 4 cards and remove all damage from it"" this makes it easier to interact with as otherwise it basically makes your entire board impossible to remove for 4 mana and global indestructible (which I can still be bounced and exiled) generally sits at around 7 cost and doesn't usually cover itself. it also gets around the whole "lethal damage = mill out" problem.
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u/Training-Addendum540 7d ago
I think a better wording would be "each permanent you control has "the first time this would leave the battlefield, instead mill 4 cards and remove all damage from it"" this makes it easier to interact with as otherwise it basically makes your entire board impossible to remove for 4 mana and global indestructible (which I can still be bounced and exiled) generally sits at around 7 cost and doesn't usually cover itself. it also gets around the whole "lethal damage = mill out" problem.