Overall, YgraYgra is a terrifying threat, as it turns ALL creatures into FoodFood, which can lead to some bonkers shenanigans as well as a massive YgraYgra that simply needs trample or landwalk to swing in for huge damage out of nowhere
Rending Volley already sees play in sideboards of Pioneer decks as an efficient answer to UW (blue/white) threats
[1] 2 Draw seven cards from your deck
Outside of casual tables where anything goes, the only format which allows Channel is Vintage
You might not always be able to wait that long, depending on how aggressive your opponents opening plays are, but if they go pitch a land on their first turn and hit a Kraken Hatchling, you can feel pretty safe for a few turns to hold back your lands
They also help empower some potent themes running through green in Standard right now, involving Landfall triggers