Finally, please note that on land, multi-element cards will be considered as whichever element gives them the highest terrain bonus. For example, Zyriel will receive a +10% terrain bonus on Badlands, Bogs, Forests, Hills, Jungles, Mountains, Plains, and Swamps.

Looks like it will ignore the -50% for Life on Badlands (for example) and instead provide the +10% for Death.