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You can only use each of the following effects of "Destiny HERO - Destroyer Phoenix Enforcer" once per turn

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During the Main Phase, if you do not control a "Ki-sikil" monster (Quick Effect): You can Special Summon 1 "Ki-sikil" monster from your GY, also you cannot Special Summon monsters from the Extra Deck for the rest of this turn, except Fiend monsters

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It's also searchable by the effect of "Rose Princess" a Plant monster with an effect to Special Summon itself it only the opponent controls a monster, it being treated as a Tuner while it is face-up on the field

Doomed Traveler is a very concise example: a cheap and unremarkable creature with a death trigger that makes it a prime sacrifice target