Is Benthic Biomancer legal in Standard, Modern, and Commander?

Benthic Biomancer is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Benthic Biomancer

Q: What type of card is Benthic Biomancer?

Benthic Biomancer is a Creature — Merfolk Wizard Mutant. Its oracle text reads: "{1}{U}: Adapt 1. (If this creature has no +1/+1 counters on it, put a +1/+1 counter on it.) Whenever one or more +1/+1 counters are put on this creature, draw a card, then discard a card."