As with any cards with two effects that have synergy, the design space for this mechanic is limited
In fact, one card is so powerful that the Commander Rules Committee (RC) felt the need to comment on it as soon as it was revealed
2017: Hard Hat Area I dont have positive memories of Magic in 2017
Number Nine This 3-drop three color 3/4 that adds Black to Simic or Blue to Golgari is the cheapest a three color could be, and sizeable too
When an opponent leads on a Swamp , you expect something disruptive, maybe a Thoughtseize , maybe a fast reanimation setup, but rarely something harmless
The sweet spot for it is probably exiling three creatures, as 9/9 outsizes Syphon Fuel and Crash and Burn