Firstly, Wizards says that it is not planning to do this with the already-released Walking Dead cards, meaning they will remain mechanically unique for the foreseeable future
Reiju has no problems drawing cards with her ability alone, and the stage King of Germa alongside pieces like Kaya allows for a quick board state of higher-cost characters
giving the opponent an extra land in the early game lets them deploy all their cards faster, reducing the window of time in which discard is effective
Gisela is what Id affectionately call the Boros Praetor. Much like Elesh Norn, Vorinclex and their ilk, Gisela provides a magnification of an effect for you, and a nerf to the same effect for opponents
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Wrap Up Loran of the Third Path | Illustration by Steven Belledin Enchantments can be some game-altering stuff