Black Marshall D.Teach This is a close matchup, and your biggest weakness is OP09-081-marshalldteach shutting you off from activating your On Play effects
While the list of most played spells is overloaded with relatively cheap commons and uncommons, nine of the top 10 have recently been reprinted (with Path to Exile being the only exception), and even expanding out to the 25 most played cards, only a handful need a reprint and haven't been reprinted recently (Surgical Extraction, Leyline of the Void, Manamorphose, Mox Opal, and Collected Company)
Equipped creature gets +2/+0 and has indestructible
If you need to spend 12 mana to impact the board, or just an impactful spell to cast or copy without paying the mana cost, heres your guy
If you solely care about defending, you can also check out Dragons Eye Sentry, Novice Knight, or Resolute Watchdog
However some have the argument for the card it represents 'racial cleansing'