Fortunately, some good guidelines apply: Delver/otherwise spells matter : Surgical Extraction, Grafdiggers Cage, Nihil Spellbomb Eldrazi/Lands/Combo (not predicated on critical mass and/or no hope of beating you otherwise)/Fringe Stuff Played By Person At Your Store With a Full Sleeve Tattoo and Black Flag T-Shirt: Leyline of the Void Artifact Synergy/Karn, the Great Creator Prison : Tormods Crypt, Relic of Progenitus, etc
It costs just over a mana per new card but affords you a good chunk of spells while digging a little deeper into your deck
The combined result of these two abilities will be an endless war, fought among your opponents but not involving you, giving you ample opportunities to plot, scheme, and pick the bones of your fallen foes for card advantage
I was actually really excited to see this theme as I built an Alibou, Ancient Witness deck not too long ago
While Gyarados EXs Rampaging Whirlpool discarded a random Energy from any of the Pokmon on your or your opponents playing field, Mega Gyarados EX discards the top 3 cards from your opponents deck
Probably less so when you see the artwork