This a great card for any deck that reliably gets two or more of the party creature types in play
Saheeli, Sublime Artificer I think Im less excited about Saheeli, Sublime Artificer than some of my peers, but I do recognize the value a Young Pyromancer proxy that isnt targetable by creature removal can potentially provide
5 Nightmare One of the original rare creatures from all the way back from the Alpha set, Nightmare is a powerhouse in a mono-black deck
However, traditional White Weenie has a plan for turn 3, and it involves casting a Razor Golem (better power to cost ratio) or a Squadron Hawk (pure card advantage)
Theres a catch: It must be the top card from your graveyard (yes, Mirage had nonsense restrictions like this)
Buying the singles for this deck individually will run you about $170 since its Jet Medallion is still the most expensive of the cycle