It seems that a good number of decks are using Emeria Angel at Worlds this year, with one even using Aven Mimeomancer to make the bird tokens 3/1. Zendikar's bird maiden has already sold out everywhere on MTGO and has surged in price, but paper cards haven't seen the same reaction. Yet. Go grab as many as you can from sites selling them for a dollar right now.
It would also pay to pick up some Aven Mimeomancers on MTGO as they are cheaper than fresh dirt.