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If you can get to 6 mana reliably, the artifact takes your board presence to another level and helps to finish off games with plenty of card draw to boost this presence

DARK is the only main Attribute represented by two Signer Dragons instead of one ("Red Dragon Archfiend" and "Black-Winged Dragon"), while WATER is the only main Attribute not represented by any of them ("Stardust Dragon" is WIND, "Black Rose Dragon" is FIRE, "Ancient Fairy Dragon" is LIGHT, and "Life Stream Dragon" is EARTH).

you will not need to collect them separately

And in the energy deck, if you have energy about you can often spend just 2 mana and get Farewell at home minus the exile

it's an ultra-rare artifact from the game's creation