Regenerating a creature can be gamesaving against removal, and preventing combat damage is excellent when you're facing aggressive strategies
Key cards to include: Optimus Prime, Hero, el]Megatron, Tyrant[/el], Daretti, Rocketeer Engineer, Clown Car, and Smugglers Copter
Its kind of silly how much time those games took for a two mana enchantment
The Voidwalker also works greatly with the likes of Inquisition of Kozilek and Thoughtseize, where you can take an opponents key spell and later use it against them
Simply exert characters matching the ink cost of that song
Steels damage abilities make the banish choice highly valuable against Tamatoa and Mufasa in Sapphire, tricky Evasive or Bodyguard characters, or anything you just need gone