
Flying, vigilance, deathtouch, lifelink
At the beginning of your end step, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
Atraxa is a 4-color value engine that snowballs any kind of counter—+1/+1, loyalty, charge, poison, even -1/-1—via her end-step proliferate. You ramp into her on turn 4, then build an engine around a counter theme (planeswalkers, infect, +1/+1, or superfriends) and let proliferate multiply your advantage every turn until you overwhelm the table.
Tighten the mana base with fetchlands, duals, and Triomes plus mana rocks like Arcane Signet and Fellwar Stone so Atraxa lands reliably on curve. Add more proliferate density (Flux Channeler, Tezzeret's Gambit) and counter doublers, then pick a focused win package—either a planeswalker ultimate suite or a compact infect/poison core—rather than spreading thin across themes. Include protection like Heroic Intervention and Teferi's Protection to defend your engine from wipes.
Played-with rates from 2 Mythicwyrm decks.
→ Infinite turns, Lock
→ Infinite turns, Lock
→ Infinite turns, Lock
→ Lock, Infinite turns
→ Infinite turns, Lock
Combos via Commander Spellbook.
Same color identity (BGUW), by popularity.