waiting three turns for something to arrive is an eternity in Magic, especially if you've already waited five turns just to play your Commander
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Koala Alternate Art (OP13-019) at $28-32 demonstrates how even secondary Revolutionary Army characters maintain value through dedicated collector bases and Sabo deck synergies
Aside from being a human, which is a very relevant creature type in Commander, Modern and basically every other MTG format, Esper Sentinel is good because it reads: Whenever an opponent casts their first noncreature spell each turn, draw a card unless that player pays X, where X is Esper Sentinels power. Its a bit like Rhystic Study, but the cost can be far higher if youve got things that make humans stronger or you can put +1/+1 counters onto Esper Sentinel
Be aware that this is one dead horse I'll be beating for a while in this series
You'll also be able to regularly retrigger enchantress abilities by returning things to the battlefield with finality counters on them