Is Snow Fortress legal in Standard, Modern, and Commander?

Snow Fortress is legal in: Legacy, Vintage, Commander.

What type of card is Snow Fortress?

Snow Fortress is an Artifact Creature — Wall. Its oracle text reads: "Defender (This creature can't attack.){1}: Snow Fortress gets +1/+0 until end of turn.{1}: Snow Fortress gets +0/+1 until end of turn.{3}: Snow Fortress deals 1 damage to target creature without flying that's attacking you."

Snow Fortress

Artifact Creature — Wall

Defender (This creature can't attack.)<br>: Snow Fortress gets +1/+0 until end of turn.<br>: Snow Fortress gets +0/+1 until end of turn.<br>: Snow Fortress deals 1 damage to target creature without flying that's attacking you.