If “Toon Mermaid” is turned face-down by an effect, it may not be Flip Summoned unless “Toon World” is face up on the summoning player’s field.
If either player’s “Toon World” is destroyed while “Toon Mermaid” is face-up and active on the field, “Toon Mermaid” is destroyed.
“Toon Mermaid” may be Special Summoned from the Graveyard if it has been Special Summoned properly once and the summoning player has “Toon World” on his or her field.
“Toon Mermaid” may not attack the same turn it is Special Summoned, regardless of how it was Special Summoned.