Is Aspect of Hydra legal in Standard, Modern, and Commander?

Aspect of Hydra is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Aspect of Hydra

Q: What type of card is Aspect of Hydra?

Aspect of Hydra is an Instant. Its oracle text reads: "Target creature gets +X/+X until end of turn, where X is your devotion to green. (Each {G} in the mana costs of permanents you control counts toward your devotion to green.)"

Instant

Target creature gets +X/+X until end of turn, where X is your devotion to green. (Each in the mana costs of permanents you control counts toward your devotion to green.)

Set Pioneer Masters

Rarity Uncommon

Artist Mark Winters