See Request (3) - Quests.

New keyword ability: "Completion" and associated phrase "completed this quest." A quest is completed if there are as many quest counters on it as the value ofter the keyword "Completion".

New term: defeated (dies and your creatures dealt damage to it this turn.)

Hmm. More precisely, "is defeated by X" means "dies and X dealt damage to it this turn"? Yeah, I could buy that. Makes the wording of Sengir Vampire abilities a bit nicer. That's not enough motivation on its own, of course, but I imagine Boss Fights would make use of the term too.

Hmm; wording it this way feels more natural that it should enter play with 3 tokens, and remove them to mark completion.

Which has the advantage of being able to see at a glance how close quests are to completion; but has an up-front cost and removing counters feels like a cost, rather than a reward.

Don't think defeated is strictly needed; but I do like it, those words are common enough to need shortening the way RFG was. (And why hasn't UEOT and ETB had it?)

People do keep proposing things like "arrives" for "enters the battlefield", but I don't think any of the proposals I've seen are clear enough to be understood by the majority of casual players.

On the topic of this card, I do love the idea of common quests parodying the ridiculous early missions you get in MMORPGs.

Mmm, I like the idea of easy quests. I dislike them being ridiculous parodies - that's gonna make people hate them. But the actuality of this (roughly "Kill three things in combat") with a reward that is small but not too bad; seems ok.