We just had a quick conversation about power creep
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
The clause on Tyvar might seem good if you add him (which is good idea, btw- he'll be worth it even if he doesn't stick around too long), but even then you have to remember that he won't find Tyvar the majority of the time
This art remains one of the most famous cards from the early days of Pokemon and the original is available in Jungle
Against the creature heavy decks you typically want to be hitting the non-creature cards
Since I made the original post, massive updates have occurred, so I felt the need to move OP to the dropdown below as a way to make room for the current state of my collection