Is Phthisis legal in Standard, Modern, and Commander?

Phthisis is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Phthisis?

Phthisis is a Sorcery. Its oracle text reads: "Destroy target creature. Its controller loses life equal to its power plus its toughness. Suspend 5—{1}{B} (Rather than cast this card from your hand, you may pay {1}{B} and exile it with five time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)"

Phthisis

Sorcery

Destroy target creature. Its controller loses life equal to its power plus its toughness.

Suspend 5— (Rather than cast this card from your hand, you may pay and exile it with five time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)