It is best utilized with Lion's Eye Diamond, when you can discard your hand, produce mana, and pay for one of the discarded cards, which practically turns Lion's Eye Diamond into Black Lotus, the most powerful card in MtG
That creature is now your Ring-bearer. They can only be blocked by creatures with a lower power
Alena, Kessig Trapper works best with well-known partner Halana, Kessig Ranger in the command zone, where Alena pays for Halanas trigger, which is a cool combo, but barely counts as ramp
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But you are not buying real Magic cards, you're buying fun playtest proxies