Is Connecting the Dots legal in Standard, Modern, and Commander?

Connecting the Dots is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Connecting the Dots?

Connecting the Dots is an Enchantment. Its oracle text reads: "Whenever a creature you control attacks, exile the top card of your library face down. (You can't look at it.) {1}{R}, Discard your hand, Sacrifice this enchantment: Put all cards exiled with this enchantment into their owners' hands."