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Moonshadow Moonshadow is an incredibly efficient 7/7 Elemental for just a single black mana

The only argument I can possibly dig up are these print test cards

but Jace has had a lot of days in the sun

Esper Sentinel Like Mystic Remora, but in white and much, much better: It has no cumulative upkeep, and it can block in a pinch

Valakut Awakening / Valakut Stoneforge Valakut Awakening sees a lot of play in EDH combo decks as a filter card selection piece that allows you to fix bad hands or to get rid of some redundancy you might have

This may change with the release of Thrones of Eldraine, however, as Standard has a critical mass of cards that shave the top of your opponents library down