Stamina Recovery (Box Topper) (BSS02-135) [Battle Spirits Saga Promo Cards]

[Burst: When Opponent Resolves a Spirit's "When Summoned" Effect]
Select up to three of your green spirits. Place a core from the void onto each of them. You may then pay this card's cost to activate its flash effect.
Main / Flash
Select a spirit. It gains 2000 BP during this turn.