Goldenglow Moth

The lifegain here is bought with a real cost: the trigger only fires on the block, so this never controls when it pays out. You commit the body to combat, the attacker chooses whether to oblige, and only then do you bank four life. That makes it a deterrent rather than a tool, a flyer an attacker can simply route around if the four-point swing matters to them. And because the body is so fragile, the bank usually happens once: a 0/1 dies to nearly anything it blocks, so the four life is the last thing it does, not a tax it keeps levying turn after turn. Against a ground-based aggressor it is a wall that thanks you for using it; against anything evasive it does nothing it was not already doing as a chump. The flying matters more than the toughness suggests, since it lets the moth answer a flyer the rest of the board cannot reach, eat the damage, and refund the life all at once. This is the kind of soft, one-shot life cushion white has long handed to defensive decks among its cheapest creatures: a speed bump that asks the opponent whether four life is worth changing their attack, then trades itself away to collect on the answer. Cheap, narrow, and entirely reactive, it does nothing unless the game gives it something worth blocking.