Froterian Battlestead

Trample
When Froterian Battlestead enters the battlefield, Fossilize it X times, where X is equal to the number of lands you control. (put X fossil counters on it. during each one of your upkeeps remove a fossil counter from it and put a revelation counter on it. When it hits 0 fossil counters, sacrifice it)
When Froterian Battlestead leaves the battlefield, destroy Y target non-creature permanents with mana value Y or less, where Y is equal to the number of revelation counters on it