mtg doctor's companion cards The Best Green In Universes Beyond: Doctor Who In All 15 Doctor Who Commanders

There's so much looting and rummaging that you get to churn through your deck quickly, reducing variance and making sure you find the cards you need (and discarding the ones you don't) reliably, WITH ONE MAJOR EXCEPTION (see The Bad) It's very consistent

As we can see in many Hammertime decks, it is often the only reason to play black as it is so good at slowing down anything your opponents might be doing

This turns every single-target pump spell into a mass pump spell, granting massive damage for a low mana investment

Previously, these filled the role of being the standard set booster pack used to build decks and casual collections