Whoa boy, there are a lot more than 2, haha.
So, lets take Bowser as the punching bag.
Here are the more practical ones.
Strong Nair> Footstool> Dair lock- Probably from 5-35
Weak Nair > Footstool > Dair lock- probably from 25-55
Fully charged shuriken > Footstool > Dair lock- about 0-10
Catch airborne players with Falling up air > footstool > Dair lock - works from 0 until dair spikes, maybe at 60 or 70
Falling up air > Footstool > Dair spike > Footstool > Bair lock - works past 100 on heavies generally
There's a weird middle ground after Dair stops locking and before you can get a footstool after the spike. at that point,
Dair (Spike) > Dair (Late) > falling up air > Footstool > Dair spike > Footstool > Bair lock
From stupid labbing there are still more. Useful? No. Interesting? Sure
at 0 on grounded bowser, short hop so that the last hit of up air comes out right before you land. then footstool to dair lock.
Landing Fair > Footstool > Dair lock - from 15-30
with platforms, up tilt > footstool dair lock - probably 50-60
and finally,
at 160+
Dair spike > falling up air > footstool > REPEAT.
Gren is Pretty dank