Is Seething Skitter-Priest legal in Standard, Modern, and Commander?

Seething Skitter-Priest is legal in: Historic.

Seething Skitter-Priest

Q: What type of card is Seething Skitter-Priest?

Seething Skitter-Priest is a Creature — Phyrexian Cleric. Its oracle text reads: "Toxic 1 When Seething Skitter-Priest enters, creatures you control and creature cards in your hand perpetually gain "When this creature dies, create a 1/1 colorless Phyrexian Mite artifact creature token with toxic 1 and 'This creature can't block.'" Power/Toughness: 3/3"

Creature — Phyrexian Cleric

Toxic 1

When Seething Skitter-Priest enters, creatures you control and creature cards in your hand perpetually gain "When this creature dies, create a 1/1 colorless Phyrexian Mite artifact creature token with toxic 1 and 'This creature can't block.'"

Power/Toughness: 3/3

Set Alchemy: Phyrexia

Rarity Uncommon

Mana Value 4

Artist Monztre

Collector # 27

Scryfall