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It has to be High Tide

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While Sidisi only costs two, you do need a creature other than it in play to do the thing, and that creature is from your yard

Triggered abilities use the word "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]." Mana abilities don't use the stack and can't be responded to, so they cannot be countered this way

All you have to do is combine that with Willowdusk, and youve got an engine that will just keep on giving