Pick the Magikoopa NPC, click on the Advanced settings. Go to Projectile Hitbox Pattern and select SM63 Type-1. After that experiment it in Test Level mode.
You will see the Magikoopa will turn the SMW spinning block into yellow Koopa Troopa, it breaks after it got hitted. When it's projectile hits a SMW grey block(IDK what it's called), it will "spawn" into a Bob-omb and sometimes it spawns a Goomba.
I know nothing other than this, I think it's possible with Tea-script or nah.
