Beacon of Corwinn's Light

(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
Prevent all damage dealt to you by a target source of your choice this turn. You gain X life, where X was the amount of damage prevented this way. Shuffle Beacon of Corwinn's Light into its owner's library.
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"He is the one who lights the path, the one who shines the brightest and is the warmest light... Follow it and be rewarded.