If you're looking to pick up the rarest cards going, then you'll want to invest in the Collector Booster Box, as it has the highest pull rates going
Some designs come easy
Common Cards - 100% inclusion rate (1st - 3rd cards) Exeggcute Surskit Maractus Karrablast Phantump Grubbin Rowlet Morelull Fomantis Bounsweet Wimpod Growlithe Fletchinder Litten Salandit Salazzle Alolan Sandshrew Alolan Vulpix Wishiwashi Pyukumuku Shellder Popplio Dewpider Bruxish Pikachu Alolan Geodude Helioptile Heliolisk Togedemaru Spoink Shuppet Banette Mimikyu Cutiefly Ribombee Sandygast Cosmog Cubone Makuhita Solrock Drillbur Timburr Crabrawler Rockruff Mudbray Alolan Meowth Alolan Rattata Alolan Grimer Trubbish Mareanie Toxapex Alolan Diglett Alolan Dugtrio Jangmo-o Skitty Fletchling Pikipek Trumbeak Stufful Yungoos Gumshoos Uncommon Cards - 89% inclusion rate (4th card), 56% (5th card) Masquerain Dartrix Trevenant Lurantis Shiinotic Steenee Arcanine Alolan Marowak Oricorio Torracat Alolan Sandslash Cloyster Lapras Brionne Araquanid Alolan Graveler Charjabug Mr

Timmy/Johnny/Spike & Timmy/Spike/Johnny & Johnny/Timmy/Spike & Johnny/Spike/Timmy & Spike/Timmy/Johnny & Spike/Johnny/Timmy Timmy/Johnny/Spike wants it all
Based on the latest market prices tracked on TCG Stacked, Toy Catcher is worth about $2.64 USD
After this card lands, all the other cards you cast from hand are free, and you can do this via Show and Tell, Abuelo's Awakening, or other similar cards