If you are empty-handed and are facing down a lethal creature, you need to top deck a removal spell or lose the game
This can sacrifice itself to Tormod's Crypt everyone and it will work at instant speed
As I said earlier, its tricky to work around, especially since not every low-cost legendary meshes with your overall strategy
Its not that far off from Amazon and a little more official than selling through something like Facebook Marketplace
I think the version which most appeals to me (and might be a little less raw aggro) involves Clone and its variants to let other players spend the resources to cast big creatures, and then get copies of them on the cheap
As if it is a card with miracle , or in this case, an enchantment , you really need to keep it separate from your hand until you declare casting it for the miracle ability