I like the idea of a permanent with an active ability that generate creatures because control-able generator means you get to decide when you want to have your creature battle-ready rather than being shot down by that Fire Buckler from across the field right away.
Also, anyone giving comment should check out Ghost | Phantom to make sense of what I am going to say next. For what it does, I'd have say the cost or either this card's ability or those creature cost/ability/stat should be tweaked. Also, it does not make sense how a Haunted House supposedly attract ghosts by light looking at the ability cost. I'm sure you would have wanted to mirror the creature's ability but I feel like using darkness quanta to generate those creatures would be much better.
All in all, this card is kinda okay except change the ability cost to
. But something needs to be done about the creature when they're involved or otherwise this would be too powerful.