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When Llanowar Sentinel enters the battlefield, you may pay
. If you do, search your library for a card named Llanowar Sentinel, put that card onto the battlefield, then shuffle.
Llanowar Sentinels can “chain”: If you put a second Llanowar Sentinel onto the battlefield as a result of this ability, that creature’s enters-the-battlefield ability triggers and allows you to search for yet another Llanowar Sentinel.