茂みの精霊

キッカー{1}{G}（あなたはこの呪文を唱えるに際し、追加で{1}{G}を支払ってもよい。）
茂みの精霊が戦場に出たとき、これがキッカーされていた場合、クリーチャー・カードが公開されるまで、あなたはあなたのライブラリーの一番上からカードを１枚ずつ公開してもよい。そうしたなら、そのカードを戦場に出し、これにより公開されたすべてのカードをあなたのライブラリーに加えて切り直す。

Thicket Elemental

Kicker {1}{G} (You may pay an additional {1}{G} as you cast this spell.)
When Thicket Elemental enters, if it was kicked, you may reveal cards from the top of your library until you reveal a creature card. If you do, put that card onto the battlefield and shuffle all other cards revealed this way into your library.

Duel Decks: Nissa vs. Ob Nixilis

Kicker {1}{G} (You may pay an additional {1}{G} as you cast this spell.)
When Thicket Elemental enters the battlefield, if it was kicked, you may reveal cards from the top of your library until you reveal a creature card. If you do, put that card onto the battlefield and shuffle all other cards revealed this way into your library.

Invasion

Kicker o1o
G (You may pay an additional o1o
G as you play this spell.)
When Thicket Elemental comes into play, if you paid the kicker cost, you may reveal cards from the top of your library until you reveal a creature card. If you do, put that card into play and shuffle all other cards revealed this way into your library.

The “if you do” means “if you choose to reveal cards”. You still shuffle if you have no creature card in your library.