Is Altac Bloodseeker legal in Standard, Modern, and Commander?

Altac Bloodseeker is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

Altac Bloodseeker

Q: What type of card is Altac Bloodseeker?

Altac Bloodseeker is a Creature — Human Berserker. Its oracle text reads: "Whenever a creature an opponent controls dies, this creature gets +2/+0 and gains first strike and haste until end of turn. (It deals combat damage before creatures without first strike, and it can attack and {T} as soon as it comes under your control.)"

Creature — Human Berserker

Whenever a creature an opponent controls dies, this creature gets +2/+0 and gains first strike and haste until end of turn. (It deals combat damage before creatures without first strike, and it can attack and as soon as it comes under your control.)