its often seen in combo lists like Ad Nauseam and Cascade Foothills in Modern because those decks do something powerful enough to mitigate the card disadvantage
While this is undoubtedly powerful, Llanowar Elves and elf mana dorks like it would really like to attack, but if they tap for mana, it becomes more like outlast, which is OK, but not very powerful the later it gets in an EDH game
As a one-shot, it doesn't seem that strong, but thanks to cards like Ephemerate and Phelia, Exuberant Shepherd, we can potentially be taxing our opponent every single turn by blinking Tax Collector
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Once you do it becomes their burden to pay the upkeep cost on it
Whether you're going for fast-paced ramping, quick damage combos, or threatening your opponents, there are always plenty of ways to improve on already solid foundations