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
Therefore, it is likely that these test prints were made in advance of the release of Base Set 2, which featured the Cosmos holofoil pattern on all holo cards
The Away is an instant that forces a sacrifice for three mana, one more than Diabolic Edict
'Day Two' invites were usually accompanied by travel awards and stipends paid by Play
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These spells are powerful, game-changing cards that can decide the course of a match