Thran Turbine — ruling 1

Any of this mana that isn’t spent during your upkeep step will be removed before your draw step begins. You cannot save it to be spent on the card you will draw this turn.

Thran Turbine : règles, fonctionnement et interactions (MTG)

Thran Turbine is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

At the beginning of your upkeep, you may add . This mana can't be spent to cast spells.

How it works : Thran Turbine

Original English text — Wizards of the Coast / Scryfall

#1January 25, 2011· Wizards of the Coast
Any of this mana that isn’t spent during your upkeep step will be removed before your draw step begins. You cannot save it to be spent on the card you will draw this turn.
No other card is named in this ruling.