At the beginning of your upkeep, if a player has more life than each other player, the player with the most life gains control of Ghazbán Ogre.
During your upkeep, if a player has more life than any other, he or she gains control of Ghazbán Ogre.
"We were holding our own—until the ogre guiding us suddenly grinned and turned on our commander."
—Ivra Jursdotter, Sarpadian mercenary