March of the Machine: The Aftermath (MAT) card variants.
The previous implementation of the deathtouch ability had a bug that destroyed planeswalkers even with any amount of damage. This has been fixed.
If a player has been dealt 21 points of combat damage by a particular Commander during the game, that player loses a game. The damage rule with commanders was incorrect in counting any type of damage, not only combat damage.
Bug fixes:
Athreos, Shroud-Veiled
Endless Atlas
Natural State
Savage Gorger
Kytheon's Irregulars
Lion Sash
Pyrophobia
Minas Tirith
Sakashima of a Thousand Faces