Given how powerful being the monarch is, the cards tend to end up being too powerful when they make it easy to leverage being the monarch, or too weak when its too easy for your opponent to take the monarch from you
Most of the decks presented up above are pretty high power, and some are fairly expensive
When Dominating Vampire enters the battlefield, gain control of target creature with mana value less than or equal to the number of Vampires you control until end of turn
BPhillipYork: This has a lot of potential to create a truly gross horde of fairly beefy, well let's be honest they should be paladins not knights, but oh well
For one colorless mana, you can also tap it to untap a target permanent
Getting 1/1 tokens when you cast instants or sorceries is good, but what about 3/3 tokens with menace