yugioh pendulum spell cards Dark Neostorm Super Rare Halt DANE-EN097 up Extra Deck in your Pendulum Zone Pendulum Paradox - Yugipedia

This means that decks can always have a backup attacker on board even if they have not committed to setting up any other energy yet, making this card one of the most important recovery cards in the current meta

That means a total of 30 cards

What makes this one better is it gives you hexproof, which depending on your local meta, might be huge

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UR Ultra Rare Gem-Knight Citrine X EARTH Level 7 [ PyroFusionEffect ] ATK 2200 DEF 1950 1 "Gem-Knight" monster + 1 Pyro monster Must first be Fusion Summoned

Its worth noting that the Dualcaster Mage combos create infinite copies, not infinite casts of the instants and sorceries they use