Is Shape Stealer legal in Standard, Modern, and Commander?

Shape Stealer is legal in: Modern, Legacy, Vintage, Commander.

Shape Stealer

Q: What type of card is Shape Stealer?

Shape Stealer is a Creature — Shapeshifter Spirit. Its oracle text reads: "Whenever this creature blocks or becomes blocked by a creature, change this creature's base power and toughness to that creature's power and toughness until end of turn."

Creature — Shapeshifter Spirit

Whenever this creature blocks or becomes blocked by a creature, change this creature's base power and toughness to that creature's power and toughness until end of turn.

Set Saviors of Kamigawa

Rarity Uncommon

Mana Value 2

Artist Jim Nelson

Collector # 55

Scryfall Gatherer