Is Sheltering Ancient legal in Standard, Modern, and Commander?

Sheltering Ancient is legal in: Modern, Legacy, Vintage, Commander.

Sheltering Ancient

Q: What type of card is Sheltering Ancient?

Sheltering Ancient is a Creature — Treefolk. Its oracle text reads: "Trample Cumulative upkeep—Put a +1/+1 counter on a creature an opponent controls. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) Power/Toughness: 5/5"

Creature — Treefolk

Trample

Cumulative upkeep—Put a +1/+1 counter on a creature an opponent controls. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

Power/Toughness: 5/5

Set Coldsnap

Rarity Uncommon

Mana Value 2

Artist Pete Venters

Collector # 121

Scryfall