Does Spouting Spirits Stack?

Spouting Spirits Spirit Link Totem's radius is increased by 15%, and it restores health to all nearby allies 1 second after it is dropped. The radius increase does not stack.

Does perforate stack?

Perforate: Using Backstab from behind increases the damage of Backstab for 12 seconds, stacking up to 3 times. Each Backstab from behind also reduces the cooldown of Shadow Blades by 0.5 seconds.

Does bursting flare stack wow?

Bursting Flare Casting Conflagrate on a target affected by your Immolate increases your Mastery for 20 sec, stacking up to 5 times.