Is Voldaren Thrillseeker legal in Standard, Modern, and Commander?

Voldaren Thrillseeker is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Voldaren Thrillseeker

Q: What type of card is Voldaren Thrillseeker?

Voldaren Thrillseeker is a Creature — Vampire Warrior. Its oracle text reads: "Backup 2 (When this creature enters, put two +1/+1 counters on target creature. If that's another creature, it gains the following ability until end of turn.) {1}, Sacrifice this creature: It deals damage equal to its power to any target."

Creature — Vampire Warrior

Backup 2 (When this creature enters, put two +1/+1 counters on target creature. If that's another creature, it gains the following ability until end of turn.)

, Sacrifice this creature: It deals damage equal to its power to any target.