You can make a deck that maximizes drawing and discarding to cast Mascot Exhibition or Overwhelming Victory from your graveyard
Herd Heirloom A viable mana rock that works for multi-colored creature decks, and it even offers a second ability that generates card advantage or helps kill your opponent (there are so many good creatures with at least 4 power)
Aspect of Mongoose Brilliant Halo Cessation Despondency Diabolic Servitude Eye of Nidhogg Fallen Ideal Fiery Mantle Fool's Demise Fortitude Giant Inheritance Glistening Oil Induced Amnesia Launch Rancor Sleeper's Guile Slogurk, the Overslime Slow Motion Sluggishness Spine of Ish Sah Spirit Loop Spreading Algae Twilight Shepherd Undying Rage Weatherseed Totem
Tinybones, Trinket Thief Also a potent commander, Tinybones, Trinket Thief enables discard strategies to thrive
Thinking about heading to an Open House (where, psst, you can buy these, even before Core Set 2019 is fully released!)
It's cheap on the cost to buy and an absolute Commander Classic for discard or other brews since you draw too