Is Thrill-Kill Disciple legal in Standard, Modern, and Commander?

Thrill-Kill Disciple is legal in: Legacy, Vintage, Commander.

Thrill-Kill Disciple

Q: What type of card is Thrill-Kill Disciple?

Thrill-Kill Disciple is a Creature — Human Mercenary. Its oracle text reads: "Squad—{1}, Discard a card. (As an additional cost to cast this spell, you may pay its squad cost any number of times. When this creature enters, create that many tokens that are copies of it.) When this creature dies, create a Junk token."

Creature — Human Mercenary

Squad—, Discard a card. (As an additional cost to cast this spell, you may pay its squad cost any number of times. When this creature enters, create that many tokens that are copies of it.)