Combat Research
Enchantment — Aura
Enchant creature
Enchanted creature has "Whenever this creature deals combat damage to a player, draw a card."
As long as enchanted creature is legendary, it gets +1/+1 and has ward 
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Justine Cruz
Dominaria United (DMU)
• #44Rulings
Because the card-draw ability is granted to the creature, if an opponent takes control of the enchanted creature and it deals combat damage while they control it, that opponent will draw a card.
(wotc • 2022-09-09)
Rulings
Because the card-draw ability is granted to the creature, if an opponent takes control of the enchanted creature and it deals combat damage while they control it, that opponent will draw a card.
(wotc • 2022-09-09)