Unlimited Edition — Uncommon
Siren's Call rulings:
10/4/2004 : It will require creatures with Haste to attack since they are able, but it won’t destroy them if they don’t for some reason.
10/4/2004 : The creature is destroyed if it does not attack because it simply can’t do so legally.
2/1/2009 : This will destroy creatures that weren’t able to attack because they had been previously tapped.
9/20/2013 : If a turn has multiple combat phases, this spell can only be cast before the beginning of the Declare Attackers Step of the first combat phase in that turn.