Lord Solar Leontus

Vigilance
{t}: Spells you cast this turn that are white and/or blue cost {x} less to cast, where X is the amount of life you gained this turn. Activate only as a sorcery.

Arcadian Leontus -- his full name and his dizzying tally of titles, privileges and ostentatious ranks placing him among the Imperium's highest echelons of nobility