Whenever you or a permanent you control becomes the target of a spell or ability an opponent controls, you may draw a card. You may draw an additional card if Rayne is enchanted.

Commander creatures you own have "When this creature enters or leaves the battlefield, draw a card."

{2}{U}, {T}, Sacrifice another creature: Reveal cards from the top of your library until you reveal a nonlegendary creature card. Put that card onto the battlefield and the rest on the bottom of your library in a random order.

{U}{U}, {T}: Gain control of target legendary permanent. (This effect lasts indefinitely.)