One other important thing to remember is that this can deal damage to a creature that might be blocking it where the Myr Battlesphere cant
Nighthawks Crimson Vow gave us a lot of great vampires and Henrika Domnathi can be great in the right deck
Fumulus, the InfestationFumulus, the Infestation: Creates creature tokens when a nontoken creature dies, serving as a way to cover mana costs with mana sacrifice outlets
The most powerful ink combinations have mostly stayed consistent, just with new characters, items, and actions to fuel them
Even if these cards were borderline unplayable, this should guarantee that finding one results in a healthy profit
Ayli, Eternal Pilgrim firmly forces that Venn diagram into a circle with a combination of lifegain and interaction that gives you plenty of chances to sacrifice other creatures for varying amounts of mana