Cogwork Assembler

Oracle Text
: Create a token that's a copy of target artifact. That token gains haste. Exile it at the beginning of the next end step.
Card Rulings
2/9/2017 The token copies exactly what was printed on the original artifact and nothing else (unless that artifact is copying something else or is a token; see below). It doesn’t copy whether that artifact is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, or so on.
2/9/2017 If the copied artifact has in its mana cost, X is considered to be 0.
2/9/2017 If the copied artifact is copying something else (for example, if the copied artifact is a Sculpting Steel), then the token enters the battlefield as whatever that artifact copied.
2/9/2017 If the copied artifact is a token, the token created with Cogwork Assembler copies the original characteristics of that token as stated by the effect that that created that token.
2/9/2017 Any enters-the-battlefield abilities of the copied artifact will trigger when the token enters the battlefield. Any “as [this artifact] enters the battlefield” or “[this artifact] enters the battlefield with” abilities of the chosen artifact will also work.
Process: Pay 7 to activate assembler and target golem. Pay 2 to copy the activated effect and target the golem again. Sacrifice the token versions of the golems in order to add WWUUBBRRGG to your mana pool. Spend nine of the ten generated mana in order to rinse, repeat.