Fortunately, sets like Marvels Spider-Man, Tarkir: Dragonstorm, and Avatar: The Last Airbender have left us with plenty of high-utility options that fit right into a budget build
Online, you're looking at the Pokmon Center website, Amazon, and hobby-focused platforms like Troll and Toad or TCGPlayer for singles
Next we have Storm, who's in red, green, and blue - which not coincidentally are the three colors with the most Storm cards
Summon: Leviathan has great synergy with our Merfolk Tribal as at I it becomes an one-sided wipe by returning each creature that isnt a Kraken, Leviathan, Merfolk, Octopus, or Serpent to its owners hand
Chart shows the price of Litten #2003 at the end of each month going back as long as we have tracked the item.