Rakor Dragon

Coresearching (You may cast this spell as an
instant that has the effects and cost of one of its
activated abilities. Then exile this creature. You
may cast this spell from exile as a creature or as
an instant.)
{5}{u/r}{u/r}{u/r}: Destroy all nonland permanents.
Activate this ability only if you have 5 life
or less, and only once per game.