Cori-Steel Cutter from Tarkir: Dragonstorm and Ketramose, the New Dawn from Aetherdrift have both supplanted existing decks in Modern, letting them flourish in the face of Guide of Souls and its ilk
If duplication gets more votes or the vote is tied, copy the spell
Deceptively open-ended, the vizier gives you the ability to flicker an incoming attacker, remove Cartouches, permanently kill embalmed creatures, and even save a creature of your own in a pinch
Well, it might be obvious to say free spells and fast mana, but theres not a huge amount of difference between a cEDH player dropping multiple rocks, and a casual player dropping a Sol Ring and a Jeskas Will with a Deflecting Swat in hand
Here are a few other ideas: Play Games With Apps Many companies use in-game advertising as a way to generate revenue
This is a WIP (work in progress) as I plan to work on it further and refine it hopefully with further community input and more factual sources