Is So Tiny legal in Standard, Modern, and Commander?

So Tiny is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

So Tiny

Q: What type of card is So Tiny?

So Tiny is an Enchantment — Aura. Its oracle text reads: "Flash Enchant creature Enchanted creature gets -2/-0. It gets -6/-0 instead as long as its controller has seven or more cards in their graveyard. *His sword sounded like a silver chime on the glass jar, and the sprite laughed with delight.*"