This card can only be Ritual Summoned with the Ritual Spell Card, "Shinato's Ark". You must also Tribute monsters whose total Level equal 8 or more from the field or your hand. When this card destroys a Defense Position monster and sends it to the Graveyard as a result of battle, inflict damage to your opponent's Life Points equal to the original ATK of the destroyed monster.
Every Ritual Monster in the game is worded the same way. (Well, they slightly changed the wording for newer ones, but Shinato's ancient.) There are no Ritual Monsters that have to be Ritual Summoned with a specific Ritual Spell.
"Ritual Monsters aren't really playable outside of relinquished because you need at least 3 cards to summon them. They are easily destroyed by trap or spell cards." --> A few months later : ritual monsters (CA) !
If this and tree frog are the only cards I want out of this box. Is it worth spending the gems. I'm thinking maybe just go for 1 and try to combo him with BLS with gateway to chaos. I'm also thinking he could be a waste cuz he looks like a less supported BLS super soldier.