Nissa, Worldwaker (SDCC 2014 Exclusive)

[+1]: Target land you control becomes a 4/4 elemental creature with trample. It's still a land. [+1]: Untap up to four target forests. [-7]: Search your library for any number of basic land cards, put them onto the battlefield, then shuffle your library. Those lands become 4/4 elemental creatures with trample. They're still lands.