If you draw "Watapon" with the effect of "Tethys, Goddess of Light", you can both activate the effect of "Watapon" and reveal it to activate the effect of "Tethys, Goddess of Light".
Place this card on the top of the Deck to Special Summon "Plaguespreader Zombie" while "Card of Safe Return" is on the field, causing you to draw it with "Card of Safe Return", then allowing you to Special Summon it.