Primal Growth

Kicker—Sacrifice a creature. (You may sacrifice a creature in addition to any other costs as you cast this spell.)
Search your library for a basic land card, put that card onto the battlefield, then shuffle. If this spell was kicked, instead search your library for up to two basic land cards, put them onto the battlefield, then shuffle.

Kicker—Sacrifice a creature. (You may sacrifice a creature in addition to any other costs as you play this spell.) 
Search your library for a basic land card, put that card into play, then shuffle your library. If you paid the kicker cost, instead search your library for two basic land cards, put them into play, then shuffle your library.

The List

Commander Anthology

Kicker—Sacrifice a creature. (You may sacrifice a creature in addition to any other costs as you cast this spell.)
Search your library for a basic land card, put that card onto the battlefield, then shuffle your library. If Primal Growth was kicked, instead search your library for up to two basic land cards, put them onto the battlefield, then shuffle your library.

Commander 2015

Kicker—Sacrifice a creature. (You may sacrifice a creature in addition to any other costs as you cast this spell.)Search your library for a basic land card, put that card onto the battlefield, then shuffle your library. If Primal Growth was kicked, instead search your library for up to two basic land cards, put them onto the battlefield, then shuffle your library.