Criteria: Cards which allow you to pay energy for an effect that has an effect if it is activated multiple times, that does not result in just more energy (get outta here, Aethertide WhaleAethertide Whale!), and is repeatable in the same turn with a cumulative effect (get outta here, Hightide HermitHightide Hermit!)
That said, you've got a 25% chance to get it back each turn by rolling 1 on a d4
You have no chance of pulling the one of one, The One Ring, but you could get the default treatment one which plays powerfully, or Orcish Bowmasters both of which are major players in Modern
I mean, we have Ornithopters that are clearly 0 casting cost, but lands do not have a casting cost, not even a 0 casting cost
My initial plan to get into Magic: The Gathering was to perfect a deck in Arena then recreate it in real life and take on the competitive scene