Edward Kenway is far from the most broken example of this (looking at you, Nadu, Winged Wisdom), but it looks priced just right to be a respectable, reliable commander
The Tenth Doctor freerolls cards into exile with suspend, and Rose Tyler beats down harder for every time counter you have represented somewhere
One of the biggest draws in recent years has been basic landcycling cards, especially the ones from Lord of the Rings
Here we have the pricing information for Prized Amalgam, a $1 card from Shadows Over Innistrad
Cloudstone Curio - Bounce shenanigans on tap
This can be especially rewarding against players with death and taxes-style strategies, since their creatures are usually tools to push that strategy forward