As long as you control a green or blue permanent, you may cast Hungering Yeti as though it had flash. (You may cast it any time you could cast an instant.)
No clan is as adept at saying "go away" as the Temur.
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.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.