Is Fearless Skald legal in Standard, Modern, and Commander?

Fearless Skald is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Fearless Skald

Q: What type of card is Fearless Skald?

Fearless Skald is a Creature — Dwarf Berserker. Its oracle text reads: "Backup 1 (When this creature enters, put a +1/+1 counter on target creature. If that's another creature, it gains the following ability until end of turn.) Double strike"

Creature — Dwarf Berserker

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

Double strike

Set March of the Machine

Rarity Uncommon

Mana Value 5

Artist Slawomir Maniak

Collector # 138

Scryfall Gatherer