Icevale Deepsea Guide Loop

Fairly easy to pull off. The requirements are Cryptid + Centaur in hand with a Centaur and any other monster in the grave in the Grave. Made stupidly easy to pull off with Salvation - you are only required to open Centaur/Cryptid + Salvation, ditching a monster and manipulating your hand and Grave to fit the necessary set-up.

Summon Centaur (1) activate effect, Normal Summon Cryptid from hand.
Cryptid Special Summon Centaur (2) in Grave. Overlay Cryptid and Centaur (1) for Deepsea detach 2 add Cryptid to hand and draw 1.
Activate the effect of Centaur (2), Normal Summon Cryptid from hand.
Cryptid Special Summon Centaur (1) in Grave. Overlay Cryptid and Centaur (2) for Deepsea detach 2 add Cryptid to hand and draw 1.
Repeat until your field is 3 Deepsea and should also have a Centaur left over and Cryptid in hand, you should be able to drop another Level 4 Icevale to make another Rank 4 monster of your choice (Maiden and Gadgetron are good picks).

You should always be looking to keep a live Centaur face-up, it's a simple loop so don't screw it up. If somehow you fail to complete the loop, running Ancient Dweller of the Deep can let you retrieve a Centaur from grave and continue your play.