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A historic spell is a spell that is legendary, is an artifact, or is a Saga

It is at least card neutral unlike its little brother Careful Study which has only ever seen play in decks with a strong graveyard theme

Thats really, shockingly, amazingly useful

Have you played any of them yourself

Also, as I stated in my answer, casual play doesn't need an extra ruling - you're already allowed to use every card from your collection.TheThirdMan TheThirdMan2017-11-16 16:16:42 +00:00Commented Nov 16, 2017 at 16:16 @TheThirdMan Having an official ruling does help for casual play though, as MaRo's rulings can be used as "evidence" to support one side and end arguments/disagreements among players.Malco Malco2017-11-16 16:23:10 +00:00Commented Nov 16, 2017 at 16:23 1@Andrew The answer is already a bit bloated now with the commander note but I will drop the MaRo ruling as well