Is Carth the Lion legal in Standard, Modern, and Commander?

Carth the Lion is legal in: Modern, Legacy, Vintage, Commander.

Carth the Lion

Q: What type of card is Carth the Lion?

Carth the Lion is a Legendary Creature — Human Warrior. Its oracle text reads: "Whenever Carth enters or a planeswalker you control dies, look at the top seven cards of your library. You may reveal a planeswalker card from among them and put it into your hand. Put the rest on the bottom of your library in a random order. Planeswalkers' loyalty abilities you activate cost an additional [+1] to activate."

Legendary Creature — Human Warrior

Whenever Carth enters or a planeswalker you control dies, look at the top seven cards of your library. You may reveal a planeswalker card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

Planeswalkers' loyalty abilities you activate cost an additional [+1] to activate.

Set Modern Horizons 2

Rarity Rare

Mana Value 4

Artist Donato Giancola

Collector # 189

Scryfall Gatherer