Cast Beacon of Tomorrows by paying ({6} magic symbol) ({U} magic symbol) ({U} magic symbol) , causing you to take an extra turn after this one and shuffle Beacon of Tomorrows into your library.
At the beginning of your combat phase, Helm of the Host triggers, creating a nonlegendary token copy of Carth with haste.
Move to your postcombat main phase.
Activate Liliana's second loyalty ability by removing zero loyalty counters from it, searching your library for Beacon of Tomorrows, then shuffling your library and putting it on top.
Move to your next turn, drawing Beacon of Tomorrows during your draw step.