you also need a nearly creatureless win condition to justify this blue enchantment
The same goes for sending permanents back to their owners hands or into their library
Ashling combines a lot of scary rules text together to make a card that looks like it will find a natural home in existing storm shells including red very easily
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
Blastoise usually falls in line behind its buddy Charizard, but Blastoise puts up a good fight against its Fire-type foe in the battle for TCG supremacy
Note that there are exceptions