That could be Swiftfoot Boots, but also consider Rising of the Day or Urabrask the Hidden
Blake Rasmussen, Jadine Klomparens and Lauren Bond (March 8, 2025)
Either of these cards should let you produce enough mana to do almost anything
There's a smattering of cards that specifically interact with otters or make otters, and many of them are nice, efficient cards, even for a spellslinger deck with inexplicably few otters: Lilypad Village Valley Floodcaller Harnesser of Storms Otterball Antics Pearl of Wisdom Rockface Village Splash Portal Stormchaser's Talent Valley Flamecaller All of this adds up to an Izzet Prowess deck that features otters, which is awesome
Each rad counter represents a life point and a milled non-land card, plus however many milled land cards are in between
4 Overclocked Electromancer "Lizard Wizard" Is Canon, Now Rejoice, fans of reptiles and complicated spellcasters, Overclocked Electromancer is here for you