Drena, Veteran Troll-Guide

Exile a creature named Drena, Novice Explorer and a Troll creature you control: Cast Drena, Veteran Troll-Guide from your library.
Landfall - Whenever a land enters the battlefield under your control, create a 3/3 green Troll creature token with hexproof.
Whenever a Troll deals combat damage to a player, its owner sacrifices it then draws a card.