In a chain, if a card will be banished : can I still activate its effects?
The effects of Switcheroroo still happen. There is no negation on Houndhorde. It's like chaining Twister to a trap for example. Trap still goes off.
You can chain your trap to that. He declares he's going to banish > You chain Switcheroroo > Card gets banished > Switcheroroo effect goes off in the chain. The only time this is different is when the card specifically states the card it's targeting (or any card) can't be chained. I can't find an example but I know some cards do state this.


For that last statement, you're absolutely correct. Banishing is just banishing. If it doesn't say it negates, it's not going to be negated.