New Blank Flame Tri1 - Sinusoidal 1 Dup 4 times so now have 5 Tri's. Then Tri5 change to Spherical 1 and Drag X down and a little to the left to stretch the tri and make it long and skinny. It might be a tad rotated and angled too.
COMPARE - Try just two transforms/triangles Tri1 - Sinusoidal 1 - change Weight from .5 to 1 Tri2 - Spherical 1 and same shape.
Similar but not quite the same. The dups result in more detail.