Is Kenessos, Priest of Thassa legal in Standard, Modern, and Commander?

Kenessos, Priest of Thassa is legal in: Legacy, Vintage, Commander.

Kenessos, Priest of Thassa

Q: What type of card is Kenessos, Priest of Thassa?

Kenessos, Priest of Thassa is a Legendary Creature — Merfolk Cleric. Its oracle text reads: "If you would scry a number of cards, scry that many cards plus one instead. {3}{G/U}: Look at the top card of your library. If it's a Kraken, Leviathan, Octopus, or Serpent creature card, you may put it onto the battlefield. If you don't put the card onto the battlefield, you may put it on the bottom of your library. Power/Toughness: 1/3"

Legendary Creature — Merfolk Cleric

If you would scry a number of cards, scry that many cards plus one instead.

: Look at the top card of your library. If it's a Kraken, Leviathan, Octopus, or Serpent creature card, you may put it onto the battlefield. If you don't put the card onto the battlefield, you may put it on the bottom of your library.