In focused strategies, these lands can easily generate five or more mana per activation
This works well with some of whites color-hating cards like Glare of Heresy and Pentarch Paladin for more offensive options
Ive built a red/white/blue cycling deck that used this card just for its cycle trigger but there were more than a few games that had been stalled long enough to end it by milling them out of draws
Creatures with the changeling ability, for example, can't be a second commander this way
Bear in mind that Shagrat will always make an army even if there's no equipment to pick up, which results in creating a 0/0 army that dies right away
Unlike Master of Ceremonies, which interacts with "voting", Mangara, the Diplomat first checks if your opponent is attacking you and/or planeswalkers you control with two or more creatures