Having creatures enter the battlefield with at least one +1/+1 counter gets a lot of support cards rolling, be it Rishkar, Peema Renegade or Atraxa, Praetors' Voice, and sets up payoffs like Inspiring Call
Not to say that there haven't been differences
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Since your only bounce method is Dragoback, use it after baiting out disruptions if you don't think you can OTK with Mirrorjade
Casting Cost: Card Type: Creature - Elf Warrior Power / Toughness: 2 / 3 Card Text: Whenever Thorn Lieutenant becomes the target of a spell or ability an opponent controls, create a 1/1 green Elf Warrior creature token
Instead of Cocoon, try Forced Adaptation, which puts a +1/+1 counter on the enchanted creature each turn without a drawback, or Spider Umbra, which gives your creature +1/+1 and reach, plus is a Totem Armor