Having reach to close out games on a board where your creatures are unable to connect is not typical for a tribal aggro deck but Sorins ability to Lightning Helix even players combined with an timely Sanctum Seeker or even Oath of Kaya present some damage to your opponent out of nowhere
Thieving Skydiver can easily steal an opponent's Stonecoil Serpent for a mere 3 mana, though you will still need to pay 1 mana for the kicker effect, even if Serpent Coil technically costs 0 mana

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The problem with pure creature tutor cards is that they only find one part of your combo, in most cases you are just better off running another threat than a tutor
Sadly, as a commander, you wont be able to make use of its channel ability initially, so it's almost always better to run it as a support card in the 99