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

Combine Guildmage is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Combine Guildmage

Q: What type of card is Combine Guildmage?

Combine Guildmage is a Creature — Merfolk Wizard. Its oracle text reads: "{1}{G}, {T}: This turn, each creature you control enters with an additional +1/+1 counter on it. {1}{U}, {T}: Move a +1/+1 counter from target creature you control onto another target creature you control."