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
First we have the court cycle, enchantments that have upkeep triggers and get better if you are the monarch, which - surprise
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
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Decks that contain three or more colors and only have basic lands often struggle to find the right lands to cast their cards
In the right deck, it's extremely easy to trigger and a surprisingly effective way of winning the game