Heritage Druid and Birchlore Rangers can tap themselves to activate their abilities through summoning sickness, and summoning sick creatures can also be used for convoke, to crew a vehicle, or waterbend
The mono-black artifacts theme has been eclipsed by the Necron cards from the Universes Beyond: Warhammer 40,000 Commander decks, but these two are the original evil artifacts build
Auras that both protect and enhance Geist are the most attractive as they not only allow him to hit harder, they make it much harder for him to die in combat
(It loses all other creature types and names.) If the enchanted creature had any abilities, including those granted by other sources, before being enchanted, it loses those abilities
They either play aggressively, which you can punish with your interaction and tapout play like Beza and Shiko or they play more passively, almost controlling, which you can punish by making land drops and casting Stock Up/Rediscover the Way
While its more expensive than Panharmonicon , the addition of an instant spell that can copy your activated or triggered abilities is quite nice and I think it helps justify the increased cost
