Blood Moon has been doing one thing since it was first printed in The Dark back in 1994
If either one of the targets of The Animus's last ability is illegal when the ability begins to resolve, nothing will happen when the ability resolves
This card, in my opinion, is truly complicated and is very hard to resolve without a judge present, because it will be affecting the game completely differently depending on which decks play against eath other
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Teneb, the Harvester [Dragon]: The effect can be awesome, pure Timmy/Tammy
Now, in fairness, the time when Balance and Mind Twist were legal in Standard predates my time playing Magic , so I don't really know if there was a specific deck or combo that caused these cards to be banned