Most players want to keep a few key pieces and let the others die
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
If it has at least one target, and all its targets are illegal when it tries to resolve, then it won't resolve and none of its effects will happen
Today, however, Commander is a much, much sleeker format
Approach of the Second Sun As Luck Would Have It Azor's Elocutors Barren Glory Battle of Wits Biovisionary Call the Spirit Dragons Central Elevator // Promising Stairs Central Elevator // Promising Stairs Chance Encounter Coalition Victory Darksteel Reactor Doctor Doom, Unrivaled Duelists' Convocation International (playtest) Epic Struggle Felidar Sovereign Form of the Approach of the Second Sun Gallifrey Stands Halo Fountain Happily Ever After Hedron Alignment Helix Pinnacle Hellkite Tyrant Jace, Wielder of Mysteries Laboratory Maniac Laboratory Maniac Liliana's Contract Luck Bobblehead Mayael's Aria Maze's End Mechanized Production Mortal Combat Near-Death Experience Now I Know My ABC's Ramses, Assassin Lord Revel in Riches Shinryu, Transcendent Rival Simic Ascendancy Test of Endurance Thassa's Oracle The Cheese Stands Alone Triskaidekaphile Twenty-Toed Toad Wowzer, the Aspirational (playtest)