Madness 1R ( If you discard this card, discard it into exile
As the ability tries to resolve, if all its targets are illegal, the ability won't resolve and none of its effects will happen
Table of Contents show What Is Type-Changing in MTG
Why play Flooded Strand in your Jeskai deck when you can play Windswept Heath to be able to play Smoldering Marsh and not be able to fetch basic Island when you are under pressure in the early turns
What Land deck doesn't want to play and crack a Wooded Foothills from the graveyard to get a land and four landfall triggers, making four elementals with Omnath, Locus of Rage, drawing four cards off Tatyova, Benthic Druid, or doing all the things off Omnath, Locus of Creation
Anyway, without further ado, lets get to it