At the end of the day, this Commander pairing offers something new to a well-established Commander archetype by providing a defender or high toughness sub-theme
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Reveal cards from the top of your library until you reveal a nonland card
Max speed Tsagan has deathtouch and other creatures you control have first strike
Not only can this be used to interfere with an opponent's mana base, as this island can force an island upon a player, it can enable the islandwalk ability, a common win condition for the tribe
I didn't consider it this time because it assumes you draw it, but "Dollhammer", which can earn advantage by destroying Dinosaur-type monsters, is well within the range of adoption