Is Outpost Siege legal in Standard, Modern, and Commander?

Outpost Siege is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Outpost Siege

Q: What type of card is Outpost Siege?

Outpost Siege is an Enchantment. Its oracle text reads: "As Outpost Siege enters, choose Khans or Dragons.• Khans — At the beginning of your upkeep, exile the top card of your library. Until end of turn, you may play that card.• Dragons — Whenever a creature you control leaves the battlefield, Outpost Siege deals 1 damage to any target."

Enchantment

As Outpost Siege enters, choose Khans or Dragons.<br>• Khans — At the beginning of your upkeep, exile the top card of your library. Until end of turn, you may play that card.<br>• Dragons — Whenever a creature you control leaves the battlefield, Outpost Siege deals 1 damage to any target.

Set Pioneer Masters

Rarity Rare

Artist Daarken