Create like 100 costumes for the numbers and your clone, then when it is time to display the number, create another variable like 'Role' for example. If role is clone,

switch costume to clone, then when making the number, have a variable for health. If role is now set to number label, switch costume to health, make it go up 20 steps depending on the size of your clone then wait 0.1 seconds and delete the number. Simple.