Urzatron
From MTG Salvation Wiki
The Urzatron is the nickname for the card trio Urza's Power Plant, Urza's Mine, and Urza's Tower all in play, which combine to provide seven mana with three lands. The Urzatron was first printed in Antiquities and has seen print in Chronicles, Fifth, Eighth and Ninth Editions.
Urza's Factory was designed such that the 
from the Urzatron can bring into play a 2/2 Assembly-Worker token each turn, which can then benefit from Mishra's Factory.
"Urzatron" may also be used to describe a deck which uses an "Urzatron" triplet, for example, Mono-White Urzatron is a deck which uses only White cards but plans to assemble the Urzatron to gain a mana advantage.
