The ability wont check to see if their total toughness is 20 or greater (or 40 or greater) until the ability resolves
Tersa Lightshatter is Faithless Looting on a body, with Haste
trying to keep it close to $100 When I put this deck together originally, I had Akroma, Angel of Fury, but it burns all of the red I have and it's really just 6 unblockable (give it protection from color) and that, by itself, is not good in my meta
One of the best reasons to play Land Destruction is because an Armageddon and a decent threat are too much for Control decks to handle
I have tried the Vivid lands, the Mirage sac lands, the Rav bounce lands, the Tri lands and even the life lands and they all saw a good amount of play
It can be built as a control deck that copies removal or combo focused on big spells like Time Warp and Jeskai Revelation