If played at the correct time, it can even prevent you from losing a duel, which could then lead to victory
Unfortunately for this mechanic, Tempest was filled to the brim with new ideas
That second activated ability makes a solid outlet for an absurd (or even infinite) amount of mana if you have a way to make that happen
Derived from the "Partner" mechanism, this allows you to have a second commander, as long as one is a Doctor and the other is a Companion of the Doctor
It's important to keep in mind that while 151's Booster Bundle is technically the cheapest set on this list, it only includes six packs, while all the other Booster Boxes listed include 36 packs
So I rebuilt the list as enchantment-creature aggro, where that ability is a natural endgame for my low curve, low card-draw deck