Against the creature heavy decks you typically want to be hitting the non-creature cards
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
This makes creatures like Maraleaf Pixie and Llanowar Elves twice as effective
The concept of abusing our graveyards has proven to be so popular that Threshold has even recently resurfaced in the latest Standard set, Foundations , showing yet again that even some of the old mechanics can find new life in Magic of today
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