When Playing against a player running "Essence Channeller" the creature becomes invulnerable to spells which cause a creature to deal the creature's damage to Essence Channeler.

I had this happen twice in a game, once with "Hunter's Tallent", and again with "Pollywallop". There was no text on the card indicating that Essence Channeler should be invulnerable and I killed another Essence Channeler on the ground with a "Hunter's Tallent". Essence channeler was only immune to direct damage when it's ability proc'd causing it to fly.

Steps to reproduce. Attack a play with Essence Channeler who does not block. Them taking damage will proc Essence Channeler's ability to fly. In your second main phase use a "Deal's it's damage spell" to deal damage to Essence Channeler, no damage will be dealt.