why think so hard ?
1) It could be the effect of the card , banish while deplete and heal like Martyr
2) AI heal cards that returns to deck could be npc and nothing else
IF U ARE SO SURE THAT YR HEAL CARDS ARE IN THE BANISHED PILE AND NOT IN THE DEPLETE PILE
PLEASE CHECK THE STATUS OF THE AI MONSTER – CLICKING THE LIGHT BLUE COLOUR
IF U ARE SO SURE THAT DOESNT AFFECT PLEASE TELLS US IN DETAILS ….