Is Helix Pinnacle legal in Standard, Modern, and Commander?

Helix Pinnacle is legal in: Modern, Legacy, Vintage, Commander, Historic.

What type of card is Helix Pinnacle?

Helix Pinnacle is an Enchantment. Its oracle text reads: "Shroud (This enchantment can't be the target of spells or abilities.) {X}: Put X tower counters on this enchantment. At the beginning of your upkeep, if there are 100 or more tower counters on this enchantment, you win the game."