This setup combos excellently with "Evigishki Tetrogre". Before this monster is Special Summoned again by the " Temple's" of effect, you can use "Gishki Aquamirror" to perform a Ritual Summon, using 1 Evigishki to summon another, then return the Tributed monster to your hand with the "Mirror's" effect. Then, use "Tetrogre's" effect to send the Mirror back to your Graveyard, along with a Spell Card from your opponent's deck, and get it back at the end of your turn when Marker is Special Summoned. After a few turns of this, your opponent will have lost every single Spell Card in their Deck.
By doing this to continuously Ritual Summon "Evigishki Mind Augus" and/or "Evigishki Gustkraken", you can also use their effects over and over again, devastating your opponent's hand or keeping reloading the best cards in your Graveyard (and/or the worst ones in your opponent's).
You can take more advantage of this card´s effect by discarding one Gishki Ritual Spell card with "Summoner Monk´s" effect, to then special summon this card and apply its effect to recover the Ritual Spell card you just discarded, while also giving you the later option to make any rank 4 xyz monster.