Phoenix
Text
If this card is destroyed by a card effect, Special Summon this card during your next Standby Phase. If you Special Summon this card in this way, destroy all Spell and Trap Cards on the field.
Rulings
[...]
If "Sacred Phoenix of Nephthys" is destroyed while it is not a Monster Card, such as when it is equipped to "Relinquished" or "Sword Hunter", its effect does not activate and it is not Special Summoned.
[...]
Twin-Headed Behemoth
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If this card is destroyed and sent from the field to the Graveyard, it will be Special Summoned during the End Phase with ATK and DEF of 1000. You can only use this effect once in the Duel.
Rulings
[...]
# If equipped to "Relinquished" and destroyed, you can use the effect of this card and it will be Special Summoned on your side of the field with ATK/DEF of 1000 points. (If you have not already used this effect once.)
[...]
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so meine Frage warum kommt Behemoth beim Opfer wieder aber der Phönix nicht?
und jetzt bitte nicht wieder " weil es Konami sagt" *winker*
sondern mal was logisches (kann man ja bei dem spiel nicht erwarten) lol
liegt es nur an "by a card effect" ?