Is Walking Skyscraper legal in Standard, Modern, and Commander?

Walking Skyscraper is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Walking Skyscraper

Q: What type of card is Walking Skyscraper?

Walking Skyscraper is an Artifact Creature — Construct. Its oracle text reads: "This spell costs {1} less to cast for each modified creature you control. (Equipment, Auras you control, and counters are modifications.) Trample This creature has hexproof as long as it's untapped. (It can't be the target of spells or abilities your opponents control.)"