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BT13-020 SR Digimon Lv.7 Alternative Art ShineGreymon: Burst Mode Color Red Yellow Cost 15 DP 15000 Digivolve Cost 1 RedYellow 5 from Lv.6 Form Mega Attribute Vaccine Type Light Dragon Card Text 1 [Special Digivolution Condition] [Burst Digivolve] 0 from [ShineGreymon] by returning 1 [Marcus Damon] to hand At the end of the burst digivolution turn, trash this Digimons top card [Effect] [When Digivolving] You may play 1 [Marcus Damon] from your hand without paying the cost

By sacrificing creatures, Ayli allows her controller to gain life equal to a sacrificed creature's toughness

We may even see this in Edge of Eternities itself

Razorfield Ripper rewards you for collecting ever more energy counters, increasing in power and toughness based on how many are in your reserve when it attacks