Is Simic Guildmage legal in Standard, Modern, and Commander?

Simic Guildmage is legal in: Modern, Legacy, Vintage, Commander.

Simic Guildmage

Q: What type of card is Simic Guildmage?

Simic Guildmage is a Creature — Elf Wizard. Its oracle text reads: "({G/U} can be paid with either {G} or {U}.) {1}{G}: Move a +1/+1 counter from target creature onto another target creature with the same controller. {1}{U}: Attach target Aura attached to a permanent to another permanent with the same controller."