This is why when the Angel touches a creature by doing combat damage, that creature gets shuffled away
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Dont forget that this can redirect a planeswalker activation like that of Kaya, Bane of the Dead or Davriel, Rogue Shadowmage
Even then, bumping a 19 up to a 20 for just one life can help
The resolution of the effect creates a wraith, then checks your total wraith count