Is Hour of Need legal in Standard, Modern, and Commander?

Hour of Need is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

Hour of Need

Q: What type of card is Hour of Need?

Hour of Need is an Instant. Its oracle text reads: "Strive — This spell costs {1}{U} more to cast for each target beyond the first. Exile any number of target creatures. For each creature exiled this way, its controller creates a 4/4 blue Sphinx creature token with flying."