Bonus sheets from previous sets sometimes have a unifying mechanical theme (in Outlaws of Thunder Junction , for example, all the cards from the Breaking News bonus sheet could commit a crime), but there's no specific mechanical thread connecting these Through the Ages cards
Otherwise, the Location gaining Lore could be quite unexpected and do well
Cerberus: Clearly aimed at URx style decks, as big spells are even bigger when you copy them
Both are nice additions to the Starter Decks already being offered from previous sets, and they're both built in a way that should be easy enough to learn from a newcomer's perspective
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Mama Odie Voice of Wisdom Mama Odie has a killer ability that I can see pairing quite nicely with Ruby decks