removing bought hero from random selection

[jooster]

as the title says, what would be the best way to go about removing a bought hero so you could only have one hero playable in the map. removing them from the tavern is easy so they cant be picked. but there is also a random selection.

 

[IncubiProtocoL]

• Untitled Trigger 001
  • Events
    • Unit - A unit Sells a unit
  • Conditions
    • ((Sold unit) is A Hero) Equal to (==) True
    • (Number of units in (Units owned by Player 1 (Red) matching (((Matching unit) is A Hero) Equal to (==) True))) Greater than or equal to (>=) 2
  • Actions
    • Unit - Remove (Sold unit) from the game

If greater the 2 doesn't work try 1. Not sure if it will count the one you just got or not.