Is Blood Oath legal in Standard, Modern, and Commander?

Blood Oath is legal in: Legacy, Vintage, Commander.

Blood Oath

Q: What type of card is Blood Oath?

Blood Oath is an Instant. Its oracle text reads: "Choose a card type. Target opponent reveals their hand. Blood Oath deals 3 damage to that player for each card of the chosen type revealed this way. (Artifact, battle, creature, enchantment, instant, kindred, land, planeswalker, and sorcery are card types.)"

Instant

Choose a card type. Target opponent reveals their hand. Blood Oath deals 3 damage to that player for each card of the chosen type revealed this way. (Artifact, battle, creature, enchantment, instant, kindred, land, planeswalker, and sorcery are card types.)

Set Mercadian Masques

Rarity Rare

Mana Value 4

Artist Mike Ploog

Collector # 177

Scryfall Gatherer