Tectonic Rift | Magic: The Gathering
Formats Tectonic Rift is Legal in
Official Oracle Text for Tectonic Rift
—Ash Kronor, Keldon warlord
Official Rulings for Tectonic Rift
9/22/2011 : The set of affected creatures isn't locked in when Tectonic Rift resolves. Creatures without flying that enter the battlefield later that turn or creatures that lose flying later that turn won't be able to block.