Activate any mana-producing permanent you control by tapping it, adding at least {1}{U}.
Activate Kelpie Guide's first ability by tapping it, untapping the mana-producing permanent.
Activate Pemmin's Aura's first ability by paying {U}, untapping Kelpie Guide.
Repeat.

Infinite mana permanents you control can produce

Kelpie Guide

Pemmin's Aura

Cast High Tide by paying {U}.
Activate an Island by tapping it, adding {U}.
High Tide triggers, adding {U}.
Activate Kelpie Guide by tapping it, untapping the Island.
Activate Pemmin's Aura by paying {U}, untapping Kelpie Guide.
Repeat from step 2.
Activate any mana-producing permanent you control by tapping it, adding at least {1}{U}.
Activate Kelpie Guide's first ability by tapping it, untapping the mana-producing permanent.
Activate Pemmin's Aura's first ability by paying {U}, untapping Kelpie Guide.
Repeat.

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