Focused Aquamirror

Add 1 "Gishki" monster from your Deck to your hand. During the End Phase, if you control a WATER Ritual Monster: You can banish this card from your GY; Set 1 "Aquamirror" Spell/Trap directly from your Deck or GY, except "Focused Aquamirror". You can only use this effect of "Focused Aquamirror" once per turn.