Teferi, Temporal Archmage

The −1 is the entire reason this Teferi became infrastructure rather than a value piece. Untapping up to four permanents reads like a tempo ability, but in a deck built around it, those permanents are mana rocks, and the arithmetic drives everything: untap rocks that each produce more mana than the activation effectively cost you, and a single tick down can be mana-net-positive. The catch is that planeswalkers natively activate once per turn, which is where The Chain Veil enters: with the Veil granting extra loyalty activations and enough rocks to stay ahead on mana, each Veil-fueled −1 untaps the rocks that pay for the next one, and the loop runs until you have the mana to win outright. The +1 climbs loyalty while it digs, smoothing draws toward whatever the build needs, and the −10 emblem hands every planeswalker you control instant-speed activations, which folds back into the same engine. What keeps the build coherent is that the ultimate is genuinely reachable: a starting loyalty of 5 and a +1 that stocks the hand while it climbs make the emblem a planned destination rather than a fantasy. As a commander, this reads as a combo nucleus rather than a value general, the rare planeswalker whose minus ability does more deck-defining work than its plus or its ultimate, and whose archetype was built by people who came for the cheap ability, not the splashy one.