Even as a relative journeyman in MTG, I tend to assume certain knowledge or forget important contextual information that I take for granted
Kicker is great early and then late too, and was introduced in many fans' favorite sets and blocks, Invasion on things like Kavu Titan and Thornscape Battlemage
11 Divine Intervention Declares The Game A Draw First Printing: Legends White mana is all about justice, defense, civilization, and the law, and that is reflected in cards that protect creatures or let players gain life to stave off death
Deal with it
They allow them to be placed on their marketplace because they dont see it as gambling in their eyes
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