Outside of a combo, having the option to pitch some unneeded lands for extra life can be crucial for survival in a game, especially if you have a Ramunap Excavator-style effect where you can replay the land, tap it for mana if able, and gain the 3 life anyways
If thats worth three mana, then go for it
If it dies or changes control after that point, that damage will still count toward Temple of Power's activation restriction
That ticket can be spent if another effect later allows you to put a sticker on something
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Whenever an opponent who controls an artifact named Wedding Ring gains life during their turn, you gain that much life