yugioh poseidra deck Poseidra, the Storming Atlantean (Quarter Century Secret Rare) - Supreme Darkness Poseidra, the Atlantean Dragon SDRE-EN001

Hidden Fates Shiny Vault TypePokmon Collector NumberSV91 RarityRare Secret Artist5ban Graphics Attacks Horn Attack30 Nature's Judgment120+ You may discard all Energy from this Pokmon

Creature Sphinx Detective6/6 Unlock the potential of your card collection

As long as Jellicent is in the Active Spot, this ability prevents your opponent from using item cards or Pokmon Tool cards from their hand

Your second example for properly summoned monsters does not work because it is not possible to attempt to Fusion Summon Sea Monster of Theseus outside of a chain, and you cannot use Solemn Judgment (or any card or effect that negates summons) to negate the Summon of a monster that was Summoned during a chain

Desolate Lighthouse will tap for colorless and then tap with Izzet and another mana to draw and then discard