At the beginning of each of your postcombat main phases, you may pay X life, where X is the number of opponents that were dealt combat damage this turn. If you do, draw X cards.
Partner (You can have two commanders if both have partner.)
Tymna turns combat damage into a steady stream of cards, paying life you regain through her lifelink and aggressive token attacks. You deploy small evasive creatures and go wide, poke each opponent for damage, then refill your hand every turn. As a Partner commander she's almost always paired with another partner to round out colors or add a second threat.
Repeatable card advantage that outpaces most non-blue decks
Lifelink keeps the life-payment engine sustainable
Cheap 3-mana body that's easy to recast and protect
Partner flexibility lets you splash into stronger color pairs (Thrasios, Kraum, Tana, etc.)
Aristocrats/tokens synergy with go-wide strategies
Drawing requires connecting in combat, so board wipes and removal stall the engine
Life payment can be punishing against burn or life-loss decks
2/1 body dies to almost anything
Needs evasion or wide boards to hit multiple opponents reliably
Slower than dedicated cEDH combo if not built around fast mana
Drip-feeds evasive flyers that connect for Tymna draws and fuel sacrifice synergies.
Add fast mana (Mana Crypt, Sol Ring, Mana Vault) and efficient tutors (Demonic, Vampiric, Enlightened) to assemble engines faster, and pick a strong partner like Thrasios for a card-advantage engine or a combo finish. Lean into low-curve evasive creatures plus Skullclamp and Esper Sentinel to maximize draws, and tighten the interaction suite with cheap removal and counterspells (via the partner's colors). Trim clunky high-cost cards so every turn either draws, protects, or advances a win.