infinite lives in super mario world

this one is probably not needed but whatever. in the super Mario world yoshis island you can obtain near infinite lives via two ways that are simple.
you need the cape powerup first and  the green switch palace unactivated. once starting the green switch palace level you will see a red shell next to a blue p switch near a brown frown block. pick up the red shell and toss it at the left wall, cape spin [b button] and stop the shell as close to the left wall as possible, then use the spin jump [r button] and bounce the shell into the air. be sure you jump without accidentally sending the shell flying to the right. if you do this right you can gain points that stack till you earn a 1 up. [max 20 consistent 1 ups].