yugioh special summon warrior from deck Spell Striker (SDWS-EN005) [Structure Deck: Warriors' Strike] – Pokemon Plug Stardust Warrior - Yugipedia

So why on earth would you want that on a ritual monster

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It's cheap and splashable so it can easily slot into any Blue deck, but being an enchantment makes it particularly juicy in Enchantress decks like Zur the Enchanter and Tuvasa the Sunlit, and in Blind Seer decks which run cards like Glamerdye so you can change Insight to trigger off whatever the most popular color is that your opponents are running

Card x 10 - Index x 3

They take all of that sales information and are able to come up with a lot of statistics to determine the real-time value of any Magic card