Whether you are looking to send behemoths into the red zone or fiddle with dice in interesting ways, counters are a great mechanic to dip into
There are cards that are rare because they were printed long ago, like Talas Warrior, or several of the pricey commons from Portal Three Kingdoms , that carry significant prices despite being totally undesired across all formats
Metallic Mimic keeps to the theme of buffing your pones , and Unsettled Mariner gives them a bit of protection against that one guy that thinks it's a good idea to putrefy your 4/3 flyer instead of the Eldrazi that just laid waste to the guy next to him
Obscura Interceptor Before Ertai Resurrected was printed, Obscura Interceptor was a very popular creature that Standard Esper decks ran to out-tempo their opponents because it offers you a similar effect that slows down your opponents plays
Even better, casting noncreature spells with mana value 3 or more pings each opponent for 2 and gains you 2 life
Give the Faerie some Lightning Greaves and you can shut players out of the game