Emerald and Rubys split ability to deal with opponents cards while working toward unleashing its own powerful characters makes it a deck that requires some practice to fully understand, needing some careful cardplay - and good luck - to overcome its less forgiving aspects
If you want something Yawgmoth-adjacent, then Erebos, Bleak-hearted is a great option
You can't pay that amount multiple times to multiply the effect
After that its really up to you
Number Six Speaking of damage, next up is the king of extra combat steps himself, Moraug
Dealing one damage on play, this can weaken characters, shut down abilities that rely on a clean bill of health, and wipe out anything that is already on the verge of being banished