It's frog Paleo. Most people looking into this deck should probably already know what the deck tries to do, and most things in this deck are pretty standard outside of a few things. Which I will go into why they're being played now.
Unending nightmare is a nifty little way to get rid of opposing back row while also being a trap so you can chain your own paleos to it, and since it's once per chain meaning you could use it multiple times per turn if you're able to take out a whole lot of back row. Although it's only useful on decks that use spells and traps that stay face up on the field, such as flood gates so I limit it to one copy and keep it in the side. It can also be swapped out for a Solem judgement of one so desires.
Lilith can tribute itself on normal summon to reveal three normal traps and your opponent chooses to set one to the field. This is obviously good as all your paleos are normal traps and since you want all your paleos set to the field at one point or another no matter what your opponent picks is good for you.
and Paleozoic Marrella and Pikaia are played as they're both able to send a paleo to the grave for set up. Marrella has the bonus that it can send from the deck and isn't just limited to paleos, and pikaia says draw two on it do of course you gotta play two.
also Marrella has a cute face and looks like a nice guy so of worse comes to worse he's great moral support for the player.
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