Is Regal Sliver legal in Standard, Modern, and Commander?

Regal Sliver is legal in: Legacy, Vintage, Commander.

Regal Sliver

Q: What type of card is Regal Sliver?

Regal Sliver is a Creature — Sliver. Its oracle text reads: "Sliver creatures you control have "When this creature enters, Slivers you control get +1/+1 until end of turn if you're the monarch. Otherwise, you become the monarch." *"It is possible that some queens are not born queens, but evolve into that form over time." —Rukarumel, field notes* Power/Toughness: 3/3"

Creature — Sliver

Sliver creatures you control have "When this creature enters, Slivers you control get +1/+1 until end of turn if you're the monarch. Otherwise, you become the monarch."

*"It is possible that some queens are not born queens, but evolve into that form over time."

—Rukarumel, field notes*

Power/Toughness: 3/3

Set Commander Masters

Rarity Rare

Mana Value 4

Artist Victor Adame Minguez

Collector # 724

Scryfall