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Likely more of a sideboard card and a meta call, but the kind of high upside tool you want in your sideboard arsenal

Serra Angel

(2) If a card(s) you control would be destroyed by battle or card effect, you can destroy 1 Regulus, the Prince of Endymion in your hand or face-up field instead

Thats because Reya Dawnbringer, in addition to a not too shabby 4/6 Power and Toughness (though you may be expecting more for such an expensive card), can bring one creature per turn back from your graveyard, returning it straight to your battlefield

Its whatever you want, but the gameplay and variability are altered enough to make these expansions feel like a new game