Hungering Yeti — ruling 1

Hungering Yeti checks if you control a green or blue permanent only as you begin to cast it. Once you begin to cast Hungering Yeti as though it had flash, it doesn't matter what happens to the green or blue permanents you control.

Hungering Yeti : règles, fonctionnement et interactions (MTG)

Hungering Yeti 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

As long as you control a green or blue permanent, you may cast this spell as though it had flash. (You may cast it any time you could cast an instant.)

How it works : Hungering Yeti

Original English text — Wizards of the Coast / Scryfall

#1November 24, 2014· Wizards of the Coast
Hungering Yeti checks if you control a green or blue permanent only as you begin to cast it. Once you begin to cast Hungering Yeti as though it had flash, it doesn't matter what happens to the green or blue permanents you control.
No other card is named in this ruling.