Is Priest of the Crossing legal in Standard, Modern, and Commander?

Priest of the Crossing is legal in: Legacy, Vintage, Commander.

Priest of the Crossing

Q: What type of card is Priest of the Crossing?

Priest of the Crossing is a Creature — Zombie Bird Cleric. Its oracle text reads: "Flying At the beginning of each end step, put X +1/+1 counters on each creature you control, where X is the number of creatures that died under your control this turn. *"Each cataclysm only strengthens our resolve." —Pytamun, Nef-tomb priest* Power/Toughness: 3/3"

Creature — Zombie Bird Cleric

Flying

At the beginning of each end step, put X +1/+1 counters on each creature you control, where X is the number of creatures that died under your control this turn.

*"Each cataclysm only strengthens our resolve."

—Pytamun, Nef-tomb priest*

Power/Toughness: 3/3

Set Aetherdrift Commander

Rarity Rare

Mana Value 4

Artist Edgar Sánchez Hidalgo

Collector # 6

Scryfall