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Giving a Creature Deathtouch and Lifelink for almost nothing is already fantastic

No, indestructible doesn't technically prevent damage, it simply stops a creature from dying to lethal damage

No abilities that trigger whenever a creature dies will trigger

However, there are practical reasons why e : Add [mana symbol], even if the text box doesnt actually contain that text or the object has no text box

(It doesn't matter that you'd be unable to actually draw a card.) Since Abundance's effect has you put a card into your hand instead of drawing a card, you'll never be forced to draw a card with an empty library.

Any enters-the-battlefield or leaves-the-battlefield abilities won't trigger