When Brokers Hideout enters the battlefield, sacrifice it. When you do, search your library for a basic Forest, Plains, or Island card, put it onto the battlefield tapped, then shuffle and you gain 1 life.
Once the witness was inside, the safe house vanished first from sight, then from memory.
![Brokers Hideout [The List]](http://www.cardmerchanttakapuna.co.nz/cdn/shop/files/mtg_placeholder_b688a2f1-019e-4623-8f57-93a282de82a4.png?v=1790782198&width=1445)