The various Swords, like Sword of Feast and Famine or Sword of Fire and Ice, are great choices, because while the creature gets the buff and the protections, you, as controller of the Sword, get the triggers, regardless of who controls Tahngarth
It can also redirect abilities, which is pretty sweet
#8 Cursed Scroll - Silver Age It bluffed being a bluffing card
Since they dont use a colored mana symbol, they can go into any Commander deck to provide an off-color basic land type, which could be interesting for domain or converge strategies outside 5-color shells
March of Swirling Mist This blue instant is one of my favorite phasing cards printed over the years
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