If none of these work, we have one more solution in store for you
Update : It looks like the fonts on some of the older cards are slightly different, perhaps due to changes in software rendering over the years
Two-mana rocks are heavily sought after among Commander players, as while modern-design is certainly improving three-mana rocks (Wand of the Worldsoul, Cursed Mirror, etc.), having access to ramp a full turn earlier is incredibly valuable for setting up an early game's foundation
Entei boasts the middle value of the three, with Suicune just ahead of it
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