
+1: Look at the top two cards of your library. Put one of them into your hand and the other on the bottom of your library.
−1: Untap up to four target permanents.
−10: You get an emblem with "You may activate loyalty abilities of planeswalkers you control on any player's turn any time you could cast an instant."
Teferi, Temporal Archmage can be your commander.
Grind out a mono-blue control game with card advantage, counterspells, and untap effects, protecting Teferi until you assemble the famous Chain Veil combo for infinite mana and loyalty activations. The -1 untaps lands or rocks to power explosive turns, and the ultimate emblem lets you fire off planeswalker abilities at instant speed. You typically win by going off with The Chain Veil + mana rocks, then a draw/X-spell outlet, or by locking the table out with stax.
Add fast mana and rocks (Mana Crypt, Sol Ring, Grim Monolith, Basalt Monolith) plus reducers like Power Artifact to make the Chain Veil combo more consistent and explosive. Tighten the counterspell suite (Force of Will, Force of Negation, Mana Drain, Pact of Negation) and add tutors (Mystical Tutor, Fabricate, Whir of Invention) to find The Chain Veil. Round out with a clean win outlet such as Blue Sun's Zenith or Aetherflux Reservoir and protection like Lightning Greaves.
Seeded from a single deck — rates appear once more public decks exist.
→ Infinite card draw, Infinite colored mana, Infinite colorless mana
→ Infinite card draw, Infinite colored mana, Infinite colorless mana
→ Infinite mana lands you control can produce, Infinite mana permanents you control can produce
→ Infinite blinking, Infinite card draw, Infinite mana permanents you control can produce
→ Infinite card draw, Infinite draw triggers, Near-infinite mana permanents you control can produce
Combos via Commander Spellbook.
Same color identity (U), by popularity.