Fishborg Doctor (DUEA-EN096) - Duelist Alliance Unlimited

If this card is in your Graveyard and all face-up monsters you control (min. 1) are "Fishborg" monsters: You can Special Summon this card, and if you do, banish it when it leaves the field. You can only use this effect of "Fishborg Doctor" once per turn. If you control a monster that is not a "Fishborg" monster, destroy this card.