The Doom of Mer

Prophecy (When you draw this, you may exile it
face up. At the beginning of your upkeep, if it's exiled
this way, put a prophecy counter on it. You may cast
it for as long as it remains exiled, and it costs {1} less
for each prophecy counter on it.)
Return all lands that aren't Islands and all
nonblue permanents to their owners hands. Put
two stun counters on each permanent.