In EDH, if I hit PlayerA for 10 with [[Varchild, Betrayer of Kjeldor]], then Varchild dies (gaining control of all survivors), then PlayerA dies on a future turn, do the 10 tokens I gathered from that player leave the game? I assume that since that player created the token they are owned by that player.
Example 4 of 800.4a seems to state that they do:
Example: Alex controls [[Genesis Chamber]], which reads, “Whenever a nontoken creature enters, if Genesis Chamber is untapped, that creature’s controller creates a 1/1 colorless Myr artifact creature token.” If Alex leaves the game, all such Myr tokens that entered the battlefield under Alex’s control leave the game, and all such Myr tokens that entered the battlefield under any other player’s control remain in the game.
I assume that I'll need to keep (up to) three seperate piles of survivor tokens, so I can correctly remove the correct number from the game once a specific player is removed.