Jmc that one in the pot doesn't look like ilama.I received some red sarteneja bullocks heart at the same time.Are you sure it wasn't those?
It easily grafted onto Cherimoya rootstock if that is any clue to go by.
I labelled it A. Diversifolia, can't remember anything else about it, have to wait for the flowers and fruit for proper ID, any of the above=named will be exciting. I'm going to take the top off if and when it goes dormant, which it has not done to date, so there will be plenty of scion material to spread around if it's a good species. As a side note, that's why I learnt to green graft, this thing is always in growth mode.