Ludevic, Necro-Alchemist

To have two commanders, both must have the partner ability as the game begins. Losing the ability during the game doesn't cause either to cease to be your commander.

Once the game begins, your two commanders are tracked separately. If you cast one, you won't have to pay an additional {2} the first time you cast the other. A player loses the game after having been dealt 21 damage from any one of them, not from both of them combined.

Ludevic's ability looks at the entire turn to determine whether the player may draw a card or not. It doesn't matter whether Ludevic was on the battlefield when the opponent lost life.

Ludevic's triggered ability triggers at the beginning of each player's end step, including yours, even if no player has lost life that turn. Whether or not a player has lost life is checked only as the triggered ability resolves.

If a player lost life and subsequently lost the game, the player whose turn it is may draw a card.

Only one card may be drawn no matter how much life was lost or how many players lost life.