Stamina

Two abilities pull against each other, and that friction is the entire idea. Vigilance is an offensive grant: attack freely and still hold the block. Regeneration is defensive insurance, a one-shot save you pay for by sacrificing the enchantment. Bolting both onto a single Aura makes the card deliberately at odds with itself, because the shield evaporates the moment you cash it in. So the vigilance is the standing rate, while the regeneration is a panic button you have to fire proactively: the shield must already be active before the destruction event lands, which means cracking the Aura while a removal effect is still pending, or before combat damage is dealt, never after. The structure rewards patience: every turn you leave it alone, the creature is a vigilant attacker, and you convert the Aura into a save only when something finally threatens it. The hazard is the familiar one for creature Auras of this vintage, the two-for-one exposure: a kill spell that resolves before you commit the regeneration, or one that simply ignores the shield, leaves you down both cards. That weakness is precisely why regeneration baked into a body (the way Thrun or River Boa carries its own) eventually pushed the Aura approach aside. This is plain, fair green creature support from a slower era, built before the game learned to punish card-disadvantageous enhancements as harshly as it now does.