Forge 2.0.06-SNAPSHOT-09.11 (Desktop Spiderman release)
Cast Vadrok with its mutate cost. Chose Underneath. Chose spell for his ability. Got stuck with a java exception that prevented the game from proceeding.
Game-0 > java.lang.RuntimeException: Unable to find commander in game snapshot: Vadrok, Apex of Thunder (100)
at forge.game.player.Player.copyCommandersToSnapshot(Player.java:2797)
at forge.game.GameSnapshot.assignGameState(GameSnapshot.java:83)
at forge.game.GameSnapshot.makeCopy(GameSnapshot.java:52)
at forge.game.GameSnapshot.makeCopy(GameSnapshot.java:38)
at forge.game.Game.stashGameState(Game.java:193)
at forge.game.phase.PhaseHandler.startFirstTurn(PhaseHandler.java:1044)
at forge.game.GameAction.startGame(GameAction.java:2343)
at forge.game.Match.startGame(Match.java:91)
at forge.gamemodes.match.HostedMatch.lambda$startGame$1(HostedMatch.java:259)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
at java.base/java.lang.Thread.run(Thread.java:1583)
(Another test where I chose Vadrok on top still got this exception)