Qasali Ambusher | Magic: The Gathering
Formats Qasali Ambusher is Legal in
Official Oracle Text for Qasali Ambusher
If a creature is attacking you and you control a Forest and a Plains, you may cast Qasali Ambusher without paying its mana cost and as though it had flash.
Official Rulings for Qasali Ambusher
10/1/2008 : If you want to cast Qasali Ambusher by using its second ability, you don't necessarily have to do it during the declare attackers step. You can do it later in combat (including all the way up through the end of combat step) as long as there's still a creature attacking you. Of course, if you cast Qasali Ambusher later than the declare attackers step, it won't be able to block.
10/1/2008 : For you to cast Qasali Ambusher as described in its second ability, a creature has to be attacking *you*. If creatures are attacking only planeswalkers, you won't be able to cast Qasali Ambusher this way. If you're playing a Two-Headed Giant game and a creature is attacking your team, you will be able to cast Qasali Ambusher this way.
10/1/2008 : Qasali Ambusher's second ability is looking for lands with the subtypes Forest and Plains. Those lands don't need to be named Forest and Plains. It's okay if both subtypes are from the same land (such as Savannah or Temple Garden).