Posporous Sandshaper

When Posporous Sandshaper enters the
battlefield untap three basic lands you control.
If you control more than 3 islands sacrifice
Posporous Sandshaper.
Dwell—whenever Posporous Sandshaper
enters the graveyard, you may cast it from there
if you have more than 10 cards in your graveyard.
Posporous Sandshaper enters the battlefield with
a +1/+1