A 2 mana investment when you can afford it, rather than constantly holding mana open, is well worth the price of entry
These both give card selection and set up big turns down the road
Archipelagore Auspicious Starrix Boneyard Lurker Brokkos, Apex of Forever Brokkos, Apex of Forever Cavern Whisperer Chittering Harvester Cloudpiercer Cubwarden Dirge Bat Dreamtail Heron Everquill Phoenix Everquill Phoenix Gemrazer Gemrazer Glowstone Recluse Huntmaster Liger Huntmaster Liger Illuna, Apex of Wishes Illuna, Apex of Wishes Insatiable Hemophage Lore Drakkis Majestic Auricorn Migratory Greathorn Mindleecher Necropanther Nethroi, Apex of Death Nethroi, Apex of Death Otrimi, the Ever-Playful Parcelbeast Pollywog Symbiote Pollywog Symbiote Porcuparrot Pouncing Shoreshark Regal Leosaur Sawtusk Demolisher Sea-Dasher Octopus Snapdax, Apex of the Hunt Snapdax, Apex of the Hunt Souvenir Snatcher Surgeon General Commander Trumpeting Gnarr Vadrok, Apex of Thunder Vadrok, Apex of Thunder Vulpikeet

The Auto-ability Search for one card with [card name (Yuri)] and a cost of 4 or lower and deploy it to the Field is added to the stack after discarding, [20-056H] Bel Dat It is still possible to cast the cards removed from the game after Bel Dat has left the Field