When Vashdu Survivilist blocks, till 3 (Reveal the top three cards of your library. Put all revealed lands in your graveyard, and the rest on the bottom of your library in a random order. This creature gets +1/+1 until end of turn for each land put in the graveyard this way.)
When Vashdu Survivilist dies, put a number of 1/1 white Spirit creature tokens with flying onto the battlefield equal to the number of lands in your graveyard.
See Challenge # 130. Nothing too special here. Just supporting the themes on the other cards.