Is Sporeback Troll legal in Standard, Modern, and Commander?

Sporeback Troll is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Sporeback Troll

Q: What type of card is Sporeback Troll?

Sporeback Troll is a Creature — Troll Mutant. Its oracle text reads: "Graft 2 (This creature enters with two +1/+1 counters on it. Whenever another creature enters, you may move a +1/+1 counter from this creature onto it.) {1}{G}: Regenerate target creature with a +1/+1 counter on it. Power/Toughness: 0/0"

Creature — Troll Mutant

Graft 2 (This creature enters with two +1/+1 counters on it. Whenever another creature enters, you may move a +1/+1 counter from this creature onto it.)

: Regenerate target creature with a +1/+1 counter on it.