Esper Sentinel Card draw on a human Esper Sentinel is a one-mana White 1/1 that 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. On the face of things, that means you get to draw a card unless your opponent pays one mana
You can then pay the reconfigure cost to turn the creature into an equipment and attach it to a creature you control
Based on the number of events held and the two age groups participating, it is believed that there are only 14 examples of this card in existence
It doesn't sound like a lot, especially when you have cards like Keeper of the Accord, which can do similar things every turn, but consider this: the land doesn't have to be a basic Plains, and it doesn't have to enter tapped
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