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And they arent wrong: Blue is a good color in Magic arguably the best so its no surprise that Kefnet is the way he is

In the right deck, it's extremely easy to trigger and a surprisingly effective way of winning the game

Creature - Wizard Skeleton Frost Titan Whenever this creature becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays

Obvious contenders are Snapcaster Mage and the like - creatures that accrue their value when entering the battlefield or in response to an opponent's attempt at a maneuver, and can then be used to counter a new threat later