YGO Structure Deck: Soulburner - Rules of Play says:
Straight from the animated series to real life, Soulburner's Salamangreat Deck from Yu-Gi-Oh! VRAINS offers monsters a new lease on life with its "reincarnation" strategy! Salamangreat powers up its boss monsters in a unique way. By sending your first copy of a "Salamangreat" boss monster to the Graveyard to Summon your second copy, the new one is granted an extra ability far beyond what it had in its first life!