Luxa River Ammit

Bloodthirst 3 (If an opponent was dealt damage this turn, this creature enters the battlefield with three +1/+1 counters on it.)
When Luxa River Ammit enters the battlefield, search your library for a land card, reveal it and put it into your hand, then shuffle your library.
The pack roams up and down the great river, stopping in a place to devour vulnerable prey.