Is Somberwald Alpha legal in Standard, Modern, and Commander?

Somberwald Alpha is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

What type of card is Somberwald Alpha?

Somberwald Alpha is a Creature — Wolf. Its oracle text reads: "Whenever a creature you control becomes blocked, it gets +1/+1 until end of turn. {1}{G}: Target creature you control gains trample until end of turn. (It can deal excess combat damage to the player or planeswalker it's attacking.) Power/Toughness: 3/2"