Is Floodchaser legal in Standard, Modern, and Commander?

Floodchaser is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Floodchaser

Q: What type of card is Floodchaser?

Floodchaser is a Creature — Elemental. Its oracle text reads: "This creature enters with six +1/+1 counters on it. This creature can't attack unless defending player controls an Island. {U}, Remove a +1/+1 counter from this creature: Target land becomes an Island until end of turn. Power/Toughness: 0/0"