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Diamond Weapon Commanders with innate mana reduction are always handy because cost reduction reduces command tax, so its easy to cast Diamond Weapon multiple times in a game

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Feywild Trickster may not be as strong as Delina, Wild Mage but I can see playing this in limited formats

You can get permanents back to the battlefield (and that includes fetch lands), creatures that ETB and draw a card, auras, and removal spells like Oblivion Ring

Or whatever sound tyranids make

5 Hypergenesis Similar to Living End comes Hypergenesis, a card that has had entire decks built around getting cards into play quickly to overwhelm your opponents