With the right support, it could definitely come together, and the payoff of getting an additional 2/2 plus a land is definitely worth going for
Summoning this avatar is easier when you sacrifice at least three creatures, whereupon you can use Extuss magecraft ability to return them to your hand
It doesnt trigger heroic again, which is either a shame or incredibly balanced
Theres numerous ways to use the box once opened too, thanks to the sturdiness of the magnetised cover
You can also send one at you to self-mill a lot for your own graveyard synergies while also hitting your foe once for a big fat mill as well following by exiling removal like Nihil Spellbomb or Bojuka Bog.I love this with the Incarnation cycle like Anger, Wonder, Glory and Genesis
If this happens, not only does the chapter ability you landed on trigger, but any ones you passed along the way