Agent of Tezzeret

At the beginning of your upkeep, create a Gold
token that has "Sacrifice this card: Add one mana
of any type"
At the beginning of your end step, if you have 12
total mana in your mana pool, turn this card into
"The Machine"
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[The Machine]
Mana does not empty from your mana pool as
phases end. Spells you control cost {2} less to cast.