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The infamous Legacy duo should be the first place you look, and Loot Dispute is another cracker

L'Cie are beings granted power by divine entities (generally summons) to fulfill a task - or Focus - given to them

Along with the actual cards, a host of new accessories will be released that include two playmats featuring Elsa The Fifth Spirit from Disneys Frozen and Donald Duck Buccaneer

In the official announcement article, Wizards noted that these cards are getting the hammer Due to their power level, ability to accelerate mana, and/or status as free spells. The latter point easily explains two of the pre-bans here, Fireblast and Pyrokinesis