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Tezzeret, the Conspirator has a casting cost of two generic, one blue, and one black mana, enters the battlefield with five loyalty counters and has the following abilities (credit for ability translation goes to reddit user jack651411): +1: Create a colorless artifact token named "Etherium Stone," which has "Tap: Sacrifice this and add one mana of any color into your mana pool"

These didnt end up being all that good in the context of the set, given that it was pretty fast and aggressive, so late games were considerably less common

WUBRG decks are always a little tricky to judge if they're not blatantly powerful right out of the box, and because the theming of this deck is so cool, it feels disruptive to try and make upgrades to it, so it's almost a case of being a precon that you shouldn't upgrade, but yet it desperately needs it

The only downside of this card is that its Legendary, meaning you can only have one in play at a time