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
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
you do not get your normal draw while your hand is full, and any Ability that draws cards or adds cards to your hand becomes unusable
Only two cards belonging to the same meld pair can be melded
This art remains one of the most famous cards from the early days of Pokemon and the original is available in Jungle