Is Aboroth legal in Standard, Modern, and Commander?

Aboroth is legal in: Legacy, Vintage, Commander.

Aboroth

Q: What type of card is Aboroth?

Aboroth is a Creature — Elemental. Its oracle text reads: "Cumulative upkeep—Put a -1/-1 counter on this creature. (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.) *The *Weatherlight* banked sharply as the colossal beast rose up to crush the lone rider. "My bet's on the dirt," Gerrard said flatly.* Power/Toughness: 9/9"

Creature — Elemental

Cumulative upkeep—Put a -1/-1 counter on this creature. (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.)

*The *Weatherlight* banked sharply as the colossal beast rose up to crush the lone rider. "My bet's on the dirt," Gerrard said flatly.*

Power/Toughness: 9/9

Set Weatherlight

Rarity Rare

Mana Value 6

Artist Brom

Collector # 117

Scryfall