Why didn't you include Kiseitai on this list? When attacked in face-down defense, it attaches to the attacker, giving you half their ATK every one of their turns!

Answer

With a limited number of slots, I can't include everything, but I appreciate the suggestion.

Unfortunately, it's easy to remove Kiseitai from your opponent simply tributing the attached monster or using it as material in another summon, or even you yourself destroying it. It has its uses, but "attach" cards like Kieseitai, Blast Sphere, and Nightmare Wheel have decreased in usefulness as the years have passed.

Updated on May 13, 2018

Original Article:

Top 10 Cards to Regain Life Points in Yu-Gi-Oh
By Jeremy Gill
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