Is Waker of Waves legal in Standard, Modern, and Commander?

Waker of Waves is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Waker of Waves

Q: What type of card is Waker of Waves?

Waker of Waves is a Creature — Whale. Its oracle text reads: "Creatures your opponents control get -1/-0. {1}{U}, Discard this card: Look at the top two cards of your library. Put one of them into your hand and the other into your graveyard. *On the open sea, there is nowhere to hide.* Power/Toughness: 7/7"