Is Flailing Soldier legal in Standard, Modern, and Commander?

Flailing Soldier is legal in: Legacy, Vintage, Commander, Pauper.

Flailing Soldier

Q: What type of card is Flailing Soldier?

Flailing Soldier is a Creature — Human Soldier. Its oracle text reads: "{1}: This creature gets +1/+1 until end of turn. Any player may activate this ability. {1}: This creature gets -1/-1 until end of turn. Any player may activate this ability. Power/Toughness: 2/2"