It's my wife and I's go-to when we travel, and I can't recommend it enough
It has no rules meaning by itself, and some saga creatures don't even have Summon in the name, such as Esper Terra
Sure, you will get those cards on your next end step but that is a paltry price to pay for necromantic powers like no other
Obviously you want to have a high density of instants and sorceries to fulfill its potential as a draw engine one mana per card multiple times a turn is a goal with shooting for
Most Lords cap out at a +1/+1 boost, maybe +2/+1 at a push, but this Ghoulish Mayor can go as high as your counters take him
Think about this in affinity shells where you can sac high-cost affinity creatures for tons of cards, many of which also have affinity