reducing toughness doesnt count as damage, and creatures with no toughness arent destroyed, so regeneration cannot apply

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The benefit though is that if the board position isn't right, when you can just drop the Hydra and you can still get a 4/4 dork, without being forced to hold it in your hand, so it's always useful
I was happy for Zac, though, because I know he is going to do many great things
This change affects older modal double-faced cards as well
If the spell is countered or otherwise leaves the stack before resolving, the gift effect doesnt happen