When you rez this ice, choose 1 or more subtypes among barrier, code gate, and sentry. This ice gains the chosen subtypes while it remains rezzed.

When a turn ends, derez this ice.

[subroutine] If this ice is a code gate, the Runner loses [click] and 1[credit].

[subroutine] If this ice is a sentry, trash 1 installed program.

[subroutine] If this ice is a barrier, gain 1[credit] and end the run.