C Common Dark Eruption X SPELL Target 1 DARK monster with 1500 or less ATK in your GY
For example, the new Ruby/Steel Mushu - Majestic Dragon could easily allow this color combination to become much stronger than ever before
While his analysis isnt completely apples to apples due to Commander having more generous mulligans, you can draw a lot of valuable lessons from his thoughts here
Ungraded & graded values for all Pokemon TCG World Championships 2018 Pokemon Cards
One can argue Liliana, the Last Hope is a good example of how to do it if you want to do it, having card advantage both on her plus (in the form of removal) and minus (see also, domri rade), but both being restricted in what they can target or when they can be activated safely, while Teferi, Time Raveler is a bad example, having a minus thats unconditional card draw AND half a removal, and the right choice to pick in 95% of situations