Phoenix Cannon is a T-Spin Single (only possible in TETR.IO) -> T-Spin Double -> FinT Cannon opener by ponix1.
First Bag
Second Bag
This bag is not 100%. If possible, it can be built in any of these ways depending on the queue.
Third Bag
This bag can be built in any of these ways.
For the small chance that none of those are possible, these can be built. This isn't ideal though because for the next Z piece to spin under the I piece, the wall kick (where the O piece is) must be 1 mino higher.
Fourth Bag
This bag can be built in any way.
Alternate Path
This is an alternate path starting from the third bag that goes Incomplete T-Spin Triple -> T-Spin Double -> Incomplete T-Spin Triple -> T-Spin Double -> STSD.