Jolrael's Favor

Flash is the entire reason this aura exists. A regeneration aura cast main-phase telegraphs its plan: your opponent sees which creature you mean to protect and gets a full turn to route around the shield with exile, bounce, a sacrifice effect, or just different combat math. The flash clause closes that window. You hold up the mana, attach the aura in response to a removal spell or a block, and let the threat resolve without giving away your hand in advance. What it does not do is make the regeneration automatic: this aura only grants an activated ability, so you still have to resolve the enchantment and then separately pay to actually set up the regeneration shield before the kill spell connects. That is the cost calculus the card is really built around. The shield is never free and never passive; each save is its own , paid on top of the two you spent to attach it, which is exactly what keeps the aura from becoming a hard lock. A removal suite deep enough to fire twice in a turn simply outruns your green mana. It is a tidy take on regeneration-as-protection from an early era of green design: cheap to enchant, cheap to fire once, and engineered to win the exchange at instant speed rather than announce it a turn ahead.