Is Streambed Aquitects legal in Standard, Modern, and Commander?

Streambed Aquitects is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Streambed Aquitects

Q: What type of card is Streambed Aquitects?

Streambed Aquitects is a Creature — Merfolk Scout. Its oracle text reads: "{T}: Target Merfolk creature gets +1/+1 and gains islandwalk until end of turn. (It can't be blocked as long as defending player controls an Island.) {T}: Target land becomes an Island until end of turn."