We'll definitely want to play four of each of these so that we'll have better odds of drawing both of our "colors" early in the game
Pair Nasty End with Ringwraiths, Gollum, Patient Plotter, or best of all, Haunt of the Dead Marshes, and watch your hand grow while your opponent despairs
For this set, the art is the same as the original prints , so its easy to see the card played is the same as one youd know
Of course, the biggest upside of Zirda, the Dawnwaker is that its cost reduction applies to all permanents (see: the Basalt Monolith / Grim Monolith combos for Commander), and some artifact-based decks come very close to accidentally meeting Zirda, the Dawnwaker's companion restriction (for example, Modern Urza decks often only have Uro, Titan of Nature's Wrath as a permanent without an activated ability), so the unique wording on Zirda might open up new possibilities, compared to Biomancer's Familiar and Training Grounds, that will take time to explore