Whenever a creature token leaves the battlefield, put a +1/+1 counter on Twilight Drover.
, Remove a +1/+1 counter from Twilight Drover: Create two 1/1 white Spirit creature tokens with flying.
10/1/2005 The first ability only cares that creature tokens leave the battlefield. It doesn’t matter where they went.
10/1/2005 If a player leaves a multiplayer game, all creature tokens that player owns also leave the game. Twilight Drover’s ability will trigger once per token.
10/1/2005 If Spirit tokens created by Twilight Drover leave the battlefield, they will trigger its first ability.
10/1/2005 Note that Twilight Drover doesn’t have any way to sacrifice tokens or otherwise cause them to leave the battlefield.