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The Paleozoic cards are trap cards that can be special summoned as a monster when they are in the graveyard and a trap card is activated. They each have 1 effect when used as a trap, and they all are unaffected by monster effects when they become monster cards, which means that they are not affected by cards like Sphere Kuriboh, or Sylvan monsters. As monster cards, they have low attack, but since they are Aqua level 2 monsters, they can be boosted by using Wetlands to make them have 2400 attack.
Since they are mostly used as high attack easily summonable monsters, the Paleozoic cards can be interchanged with one another. You don't necessarily need to use, or bring 3 Canadia and Hallucigenia in the deck, but adding more copies of Canadia and Hallucigenia can be useful since they are the one that disrupt your opponent's attack. You can switch out the ones you're missing with the other Paleozoic cards like Paleozoic Eldonia, or Paleozoic Leanchoilia, which are just as useful at times.
You can tribute summon Witch Raider by using your monsters, or your trap card(s), and activate Witch Raider's effect to destroy all spells and traps your opponent controls. This benefits the Paleozoic play style since they need to be in the graveyard to activate their effects anyway, but you won't be able to special summon them this turn due to Witch Raider's effect. Witch Raider is effective against defensive stall decks that relies heavily on their trap effects, and she also destroys field spells to get rid of cards like Temple of the Mind's Eye.
You can put some standard generic backrow protection in the deck. This can give you room for some flexibility in the deck since you can put almost any trap cards to special summon the Paleozoic cards. Wall of Disruption lowers your opponent's monsters so you can survive or attack over them without Wetlands, and Hallowed Life Barrier protects you for a turn while sending a Paleozoic card to the grave. These Trap cards will also be the trigger to special summon your Paleozoic Trap cards as monsters from the graveyard. Jar of Greed is an excellent trigger, because it draws a card when it is activated allowing to gain card advantage when chained with Paleozoic monsters.
Use can use Masked Change to tribute Masked HERO Witch Raider and special summon Masked HERO Anki and push for extra damage. Masked HERO Anki is good for this because after destroying an opponent's monster he searches another Masked Change, which you can then use to special summon another Masked HERO Anki to attack again.
Stardust Re-Spark can be used to special summon Stadust Dragon in a pinch. when your opponent tries to go for the win with an attack from a special summoned monster, activate Stardust Re-Spark to special summon Stardust Dragon. If you do this and your opponent has no way to deal with Stardust Dragon, you will effectively end their battle phase.
|Only lasts until the end phase, but you can activate this at the start of the turn to special summon and get over your opponent's monsters.|
|Sends your paleozoic monsters to the grave and destroys your opponent's card(s).|
|Mostly good for negating traps since most of the cards in the deck are traps, but this can negate crucial cards. Divine Wrath can also be good.|
|Returns your banished paleozoic monster traps back to the grave so you can special summon again.|
Floodgate Trap Hole
|Prevents threatening monsters, and your paleo monsters can often get over them if you have Wetlands active.|
|Since the Paleozoic cards are special summon, you can use your normal summon to help get Wetlands more easily.|