Boy do I have your fun stuff today with the top 5 cards for split cards for Commander
The rules for Hideaway state so: (702.74a) () The exiled card gains Any player who has controlled the permanent that exiled this card may look at this card in the exile zone. During your main phase, an opponent takes his Greater Gargadon out of Suspend
This allows decks like Amulet Titan in Modern to play through countermagic, which would otherwise invalidate the strategy
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
The persist ability makes combat complicated for your opponent here since anything that survives on your field can pick off anything that survived on theirs