Is Unstoppable Ash legal in Standard, Modern, and Commander?

Unstoppable Ash is legal in: Modern, Legacy, Vintage, Commander.

Unstoppable Ash

Q: What type of card is Unstoppable Ash?

Unstoppable Ash is a Creature — Treefolk Warrior. Its oracle text reads: "Trample Champion a Treefolk or Warrior (When this enters, sacrifice it unless you exile another Treefolk or Warrior you control. When this leaves the battlefield, that card returns to the battlefield.) Whenever a creature you control becomes blocked, it gets +0/+5 until end of turn. Power/Toughness: 5/5"

Creature — Treefolk Warrior

Trample

Champion a Treefolk or Warrior (When this enters, sacrifice it unless you exile another Treefolk or Warrior you control. When this leaves the battlefield, that card returns to the battlefield.)

Whenever a creature you control becomes blocked, it gets +0/+5 until end of turn.

Power/Toughness: 5/5

Set Morningtide

Rarity Rare

Mana Value 4

Artist Brian Snõddy

Collector # 137

Scryfall