I understand that, but then I see all of these life-gaining cards played as well, such as creatures with life-gain when they enter the battlefield (ETB) or other spells
Sliver Queen was also simply freaking huge even in its base form, well above the standard curve of the time

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The highlight of the comment is easily "easy to wring a cards worth of value out of it"
You dont lose if you have no cards in your deck, only when you go to draw a card but cant
It certainly leans more towards a Pillowfort or control strategy, but you can also leverage its power through politics