Can flute of summoning dragon summon rainbow dragon? - Answers

Cards that can 'only be Special Summoned by', or 'cannot be Special Summoned except by' can only ever reach the field initially by that listed method.Flute of Summoning Dragon can never summon Rainbow Dragon. Even if the conditions are right, that's something that allows you to special summon it (at the same timing as a Normal Summon in your turn), not any external effect.Cards that state "...can only be Special Summoned by..." can be Special Summoned, for example, from the Graveyard after its initial Special Summon (by its own effect) is successful. For example, you Special Summon The Rock Spirit from your Hand by removing from play one Rock-Type monster in your Graveyard. Your opponent then somehow manages to destroy The Rock Spirit. Because it was successfully Special Summoned by its own effect, The Rock Spirit is now eligible to be Special Summoned from the Graveyard via a effect such as Call of the Haunted.