counter draw activation in games

I am trying to figure out how to have a random draw for activation, like in Bolt Action, or Warlords of Erewhon.  Different color chit for each player, one chit per unit, and chits removed as units are destroyed.  I cant just use a deck of colors because the number of chances fro selection are reduced as the game goes on and units are destroyed.  Any recommendations?

You could have a fake player (or yourself, if the mechanics would support it) and deal them cards for each of the units, then have players random steal from that player.

There are of course API solutions that could be created.