Is Emiel the Blessed legal in Standard, Modern, and Commander?

Emiel the Blessed is legal in: Legacy, Vintage, Commander, Historic.

Emiel the Blessed

Q: What type of card is Emiel the Blessed?

Emiel the Blessed is a Legendary Creature — Unicorn. Its oracle text reads: "{3}: Exile another target creature you control, then return it to the battlefield under its owner's control. Whenever another creature you control enters, you may pay {G/W}. If you do, put a +1/+1 counter on it. If it's a Unicorn, put two +1/+1 counters on it instead. ({G/W} can be paid with either {G} or {W}.)"

Legendary Creature — Unicorn

: Exile another target creature you control, then return it to the battlefield under its owner's control.

Whenever another creature you control enters, you may pay . If you do, put a +1/+1 counter on it. If it's a Unicorn, put two +1/+1 counters on it instead. ( can be paid with either or .)