That ability works in all zones, not only the battlefield
I felt like the underdog going into this game as I knew that 2-Drops, 3-Drops, and 4-Drops had stronger card pools to work with, especially when 4-Drops was helmed by Omnath, Locus of Creation, which could easily start playing multiple 4-Drops by turn 5 and was at the right mana value to start casting board wipes regularly
We really like to curve out on turns one through four and then start getting close to having the resources to combo off
This legendary team-up isnt just a running joke, but also a very powerful card
"Perpetually" allows players to permanently "change the characteristics of a cardno matter where it goes afterwards." The effect of Davriel's Withering will not leave a creature, even if it dies and returns to the board at a later stage
This card covers so many bases that it is incredibly easy to justify including it in a wide swathe of blue decks