Not typically a turn-three card, Fell Stinger works best when you can sacrifice a token or another creature that has a death trigger
Whatever you think the third best tutor and beyond are, we can all agree Vamp and Demonic Tutor are the top two
Related Using Ojer Taq, Deepest Foundation With its prohibitive mana cost and lack of removal protection, Ojer Taq does not fill quite the same role as others of its ilk
Adding to your board while generating mana is just a powerful play pattern
There are a few additional points it could have addressed within its scope such as demonstrating at least one trainer card, but on the whole it is a good introduction and there is other in-game guidance for concepts beyond those introduced in the mandatory tutorial
Flash forward a few generations, and here we have Chandra, Jace and Sarkhan Vol standing at the Eye of Ugin, which causes the ancient magic to be undone, slowly releasing the powerful Eldrazi back into the plane of Zendikar