A Ritual summon is usually done by using the specific Ritual Spell card, tributing a number of monsters whose levels equal the Ritual monsters level, and special summoning the Ritual monster from your hand
If you do add a card this way, you send the targeted card to the Graveyard, but if you don't, you get to keep the card you targeted
With that being said, a standard turn consists of six phases: 1
If this card is sent to the GY by a card effect: You can send 1 "Shaddoll" card from your Deck to the GY, except "Shaddoll Squamata"
It's strong enough to say that if you can get it out, you're guaranteed to win, but it's still difficult
Although not the better variant for the meta overall, the Demise variant of Paleozoic is generally stronger against Trickstars for a few reasons