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Forge Version: 1.6.9-SNAPSHOT-r-1u Operating System: Windows 8.1 6.3 amd64 Java Version: 1.8.0_40 Oracle Corporation java.lang.NullPointerException at forge.ai.ComputerUtilMana.calculateManaCost(ComputerUtilMana.java:1093) at forge.ai.ComputerUtilMana.payManaCost(ComputerUtilMana.java:91) at forge.ai.ComputerUtilMana.canPayManaCost(ComputerUtilMana.java:55) at forge.ai.ComputerUtilMana.determineLeftoverMana(ComputerUtilMana.java:1433) at forge.ai.ability.DamageDealAi.doTriggerAINoCost(DamageDealAi.java:744) at forge.ai.SpellAbilityAi.doTriggerNoCostWithSubs(SpellAbilityAi.java:172) at forge.ai.AiController.canPlayFromEffectAI(AiController.java:1070) at forge.ai.ability.PlayAi$1.apply(PlayAi.java:133) at forge.ai.ability.PlayAi$1.apply(PlayAi.java:112) at com.google.common.collect.Iterators$7.computeNext(Iterators.java:647) at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143) at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138) at forge.util.collect.FCollection.<init>(FCollection.java:90) at forge.game.card.CardCollection.<init>(CardCollection.java:115) at forge.game.card.CardLists.filter(CardLists.java:285) at forge.ai.ability.PlayAi.chooseSingleCard(PlayAi.java:112) at forge.ai.SpellAbilityAi.chooseSingleEntity(SpellAbilityAi.java:319) at forge.ai.PlayerControllerAi.chooseSingleEntityForEffect(PlayerControllerAi.java:159) at forge.game.player.PlayerController.chooseSingleEntityForEffect(PlayerController.java:108) at forge.ai.AiController.chooseCardsForEffect(AiController.java:1629) at forge.ai.PlayerControllerAi.chooseCardsForEffect(PlayerControllerAi.java:147) at forge.game.ability.effects.PlayEffect.resolve(PlayEffect.java:113) at forge.game.ability.AbilityApiBased.resolve(AbilityApiBased.java:48) at forge.game.ability.AbilityUtils.resolveApiAbility(AbilityUtils.java:1342) at forge.game.ability.AbilityUtils.resolve(AbilityUtils.java:1319) at forge.game.zone.MagicStack.resolveStack(MagicStack.java:523) at forge.game.phase.PhaseHandler.startFirstTurn(PhaseHandler.java:1015) at forge.game.GameAction.startGame(GameAction.java:1633) at forge.game.Match.startGame(Match.java:87) at forge.match.HostedMatch$2.run(HostedMatch.java:235) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) This occurs seemingly randomly, so only sometimes when the AI uses Jhoira. I've had it happen twice in several games. (But I really have to say that the variant is pretty damn fun. Good job!)