Talk:Frost/@comment-212.131.148.66-20160531112026/@comment-27279105-20160531112918

from the page:

Snow Globes created inside existing globes do not count toward the maximum number of instances, and Snow Globe's health can stack with repeated casts until reaching a maximum combined health of 1,000,000.

Haven't tested this explicitly, but from my T4D experiences with an EV Trin it stacks more than 4 times.