From the english rules: http://www.amigo-spiele.de/content/download.php?group=rule&f...
Then, both players may each discard one bo(h)nus card. Take it from your hand and
put it on the discard pile. After that, draw bo(h)nus cards (starting with the active player),
until you each have three again. Phase 4 ends and your opponent becomes the new active
So both players draw back up to 3 Bo(h)nus cards in every phase 4 of the game.