Liliana, Untouched by Death | Rooftop Storm | Ratadrabik of Urborg

(and one other card)

Activate
Liliana's third ability by removing three loyalty counters from it, allowing you to cast Zombie spells from your graveyard this turn.
Activate
Shapesharer by paying ({2} magic symbol) ({U} magic symbol) , causing it to become a copy of
Ratadrabik until your next turn.
Put the original
Ratadrabik into your graveyard due to the legend rule.
Each other copy of
Ratadrabik triggers, creating a nonlegendary token copy of
Ratadrabik that is a 2/2 Zombie in addition to its other types.
Cast
Ratadrabik from your graveyard by paying ({0} magic symbol) .
Repeat from step 3.