Is Taj-Nar Swordsmith legal in Standard, Modern, and Commander?

Taj-Nar Swordsmith is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Taj-Nar Swordsmith?

Taj-Nar Swordsmith is a Creature — Cat Soldier. Its oracle text reads: "When this creature enters, you may pay {X}. If you do, search your library for an Equipment card with mana value X or less, put that card onto the battlefield, then shuffle."

Taj-Nar Swordsmith

Creature — Cat Soldier

When this creature enters, you may pay . If you do, search your library for an Equipment card with mana value X or less, put that card onto the battlefield, then shuffle.