Yoshimaru, Ever Faithful

A one-mana 1/1 with Partner reads like a throwaway commander, and that is precisely the point: Yoshimaru is not the payoff, it is the meter. Every legendary permanent you control that enters (a second commander, a legendary land, an artifact, a planeswalker, a plain legendary creature) grows the Dog, so its body becomes a running tally of how legend-dense your board actually is. That reframes what "build around" means. Most white one-drops beg you to attack on turn one; Yoshimaru would rather you saturate a deck with legendary permanents and let the size accrue on its own. Partner does double duty, because the trigger fires off whichever partner you pair it with and off every legendary the two colors can dig up. The tension is that the payoff scales with a deckbuilding constraint that also narrows your card pool: the more legends you run to grow the Dog, the more you lean on cards that are singleton by rule and often overcosted for their bodies. In exchange you get a commander that costs one mana, occupies a cheap partner slot in the command zone, and turns an entire category of permanents you were already inclined to play into an incremental clock. It is a counters engine wearing the frame of a humble one-drop, and the humility is load-bearing: the smaller the printed stat line, the more the trigger is doing all the work.