For now, the must-have are the ABU lands and Force of Will. Wasteland is a four-of in many decks, but I am not ready to put it on my buy list (or rent list, really).
I could complete my JTMS play set.
And the two decks I am interested in playing long term are: Tezzeret
and UWR Miracles.
Link to the next installment in the Legacy Stash saga