Sideboard evolve as the meta change so some cards come in and out frequently but you will find here some cards that have come in the side at one point, and some card that could be played or tried regarding the meta :
Nature's Claim : self explanatory, deal with affinity and problematic enchantments/Artifacts such as Stony Silence and Blood Moon.
Warping Wail : Help deal with small creatures and fight Living End/Past in Flames/Crumble to Dust/Scapeshift and other sorcery speed combo cards. Making a 1/1 as instant speed to make a blocker or accelerate our mana for next big turn have been useful to me in the past.
Kozilek's Return : Play the same role as Pyroclasm but the instant speed actually surprise people and the trigger ability is often unexpected/forgotten. Also as a Devoid spell you can find it with Stiring and it kill Ethched Champion.
Crumble to Dust : All star versus other Tron brother and Eldrazi Temple. Also detachable with Stiring.
Pithing Needle : She will be you best friend against Fulminator Mage, annoying planeswalkers and manlands.
Defense Grid : Allow you to cast freely whatever you want again controls decks. Control deck must counter it or you will resolve everything else. Also, forcing them to counter this card give you some room to cast your big guys.
Crucible of Worlds : It feels good to have a way to recover lands in the 75. It's a slow tool but really shine in grindy matchups. Recovering/looping Ghost Quarter or Sanctum of Ugin feels really great to be honest.
Jester's Cap : Congratulations you just destroy/out speed combo deck on turn 3. You can't imagine of tasteful Ad Nauseam tears are on turn 3.
Orbs of Warding : This card come from nowhere and that's why it's so much fun to surprise people with it. Small creatures deck and burn have a rough time versus this one.
Thragtusk : Does a very good job at keeping you alive and reduce all the value Path to Exile might have in a game, as you still have the token. Usually swap with Wurmcoil Engine.
