Midnight Reaper [c]Midnight Reaper[/c] works best when your deck runs lots of creatures, specifically nontoken creatures
There are a few fringe cards, but this hits the most common discard designs
It's not every day when a Magic card hoses not a particular color or creature type, but an entire set at once
So in addition to reducing the risks of being mana flooded and mana hosed, it's also a dual land that will help you have all of your colors on time
But Feign Death, Undying Malice, and Supernatural Stamina are all decent if you have decent ETBs, costing just 1 themselves
If you find Toxic Deluge with Word of Command, you can even just kill your opponent outright