Search your library for up to X basic land cards, where X is the number of tapped creatures you control, put those cards onto the battlefield tapped, then shuffle.

Menace (This creature can't be blocked except by two or more creatures.) Whenever Lathril deals combat damage to a player, create that many 1/1 green Elf Warrior creature tokens. {T}, Tap ten untapped Elves you control: Each opponent loses 10 life and you gain 10 life.

Whenever another nontoken Elf or Berserker you control dies, you draw a card and you lose 1 life.

Return an Elf you control to its owner's hand: Untap target creature. Activate only once each turn.

At the beginning of each upkeep, untap all creatures and lands.