Crackling Club

The oldest knock against Auras is the two-for-one: spend a card to buff a creature, watch the creature die to a removal spell, lose both. This one writes its own escape hatch into the rules text. The +1/+0 is the minor mode, just enough to push an attacker through a trade or finish off a creature already softened in combat. The sacrifice ability is the reason to run it: at any point you can break the enchantment for a point of damage to a creature, which turns a pump spell into reactive removal whenever an opposing one-toughness creature shows up or a blocker needs clearing before the swing. The timing window is the whole decision. Because an Aura goes to the graveyard the instant its enchanted creature leaves play, you cannot wait for your creature to die and then cash in the damage; you have to read the threat and sacrifice the Aura while the host is still alive, converting a committed investment into a removal spell before the trade that would have stranded it. The cost of that insurance is a buff worth only a single point of power, deliberately small so the card never becomes an automatic include. What it really is, then, is a piece of cheap creature removal wearing the costume of an aggressive enchantment, with the conversion between those two roles made entirely at instant speed.