Obviously, its much more worthwhile in the go-wide decks, but at that point youve got a lot of competition, such as Horn of Valhalla, which I think is just objectively better (its two spells in one, its cheaper, its easier to equip, its got a higher ceiling drawn late, and bouncing it to your hand can let you recast its Adventure), not to mention easier to obtain for most players
In a way, this reminds me a lot of Last StandLast Stand
But I guess I was wrong, so I will add it here
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Black mana adds some removal and life drain effect to the deck, and Gilt-Leaf Winnower is a semi-evasive 4/3 that can kill a non-Elf when it enters the battlefield if it doesn't have "square stats" (same power and toughness)