Like most Magic: The Gathering cards, the value of Ratonhnhakton depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Assassin's Creed)
When Urza, Lord High Artificer enters the battlefield, create a 0/0 colorless Construct artifact creature token with This creature gets +1/+1 for each artifact you control. You can also tap an untapped Artifact you control to add one Blue mana, and you can pay five to shuffle your library and then exile the top card of your library, then you can cast it for free until the end of the turn
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Paralysis ends after this period of time and it does not require any coin to be tossed to remove the Paralysis
Scion Summoner was better since that Eldrazi token had value beyond being a relevant creature type, but in this Standard format, you can find some use for that Saproling