While all the legendary creatures well be looking at have black as part of their color identity, I am going to cover a spread of different color combinations so you can choose the one best suited to your goals and playstyle
Then if youre the monarch, this enchantment deals X damage to each opponent, where X is the number of creatures you control
For instance, the blue [c]Scornful Aether-Lich[/c] can still only be blocked by black creatures or artifact creatures, even though its blue itself
Some cards reward you for putting +1/+1 counters on themselves or other creatures, most notably Danny Pink, Basking Broodscale, and Scurry Oak
They create wildly different gamesone optimized and cutthroat, the other more deliberate and relaxed