Generally, Dragons Rage Channeler[/card] is such a strong card because of the following 2 aspects: On the one side, its a 1 mana 3/3 flyer which gets to play an aggressive game plan for Rx tempo and midrange decks
That said, the monstrous effect comes from Tibalts static ability that lets you play cards exiled with it, making it a threat in late game scenarios
Lightning Bolt is notably banned in Historic, and while Chain Lightning is a downgrade, its an incredibly powerful spell in the context of the format
Soar, strike, and smash your way to victory inMagic: The Gathering|Marvel Super Heroes
This is partially thanks to how well the cheap creatures available synergise with your big-spell theme, and partially thanks to how the mediocre removal hurts your chances of going long against green ramp players