While you may not run the latter two in an elemental deck, you will likely still have some spell discovery that can generate those cards. In theory pretty much every class can make use of a tribal synergy, but Shaman effectively has three of them between Murlocs, Totems, and Elementals, so they tend to benefit most from this card imo.
The one I'm enjoying this cycle is Circus Amalgam in Shaman. A few reasons it works:
1) Kindling Elemental (I guess this is another example, actually!) to get out a turn 3 (or coin + turn 2) Chillwind Yeti.
2) Totemic Reflection
3) Nofin Can Stop Us
While you may not run the latter two in an elemental deck, you will likely still have some spell discovery that can generate those cards. In theory pretty much every class can make use of a tribal synergy, but Shaman effectively has three of them between Murlocs, Totems, and Elementals, so they tend to benefit most from this card imo.