Creature - Demon 2/5, 3BB (5) At end of combat, gain control of all creatures blocking The Wretched as long as you control The Wretched. Once I had the strength but no wisdom; now I have the wisdom but no strength. -Persian proverb
Illus. Christopher Rush
This means it affects ones currently being blocked by this card at the end of combat and not ones that might have been removed by an effect such as General Jarkeld. [Duelist Magazine #8, Page 47]
If The Wretched blocks and regenerates, it is removed from combat, so The Wretched will not be blocking anything at the end of combat. This means there will be no creatures blocking it when the triggered ability resolves and so the ability does nothing. [D'Angelo 1999/04/25]
Note - Thie card was creature type "Wretched" until Oracle 2007/10/01, when it became "Demon".