Third of all, it'll tap lock something for two turns like, say, their Commander, triple nice
Similarly, if Lightning leaves the battlefield and later returns, you won't be able to play the cards that were exiled the first time it was on the battlefield since it's a new object
This would ideally draw into Change of Heart to take control of the opponents Apollousa, Bow of the Goddess , or Cosmic Cyclone to banish the opponents Fire King Island and trigger its effect to destroy all opponents monsters on the field
However, rare holographic cards, limited editions, promotional releases, and professionally graded cards can command significantly higher prices
For only two mana we get either a land drop or a small creature (I'm looking at you Esper SentinelEsper Sentinel), both of which are pretty good effects in the early game