Is Martyr's Soul legal in Standard, Modern, and Commander?

Martyr's Soul is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Martyr's Soul

Q: What type of card is Martyr's Soul?

Martyr's Soul is a Creature — Spirit Soldier. Its oracle text reads: "Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) When this creature enters, if you control no tapped lands, put two +1/+1 counters on it."