Rules update 1st May 2016:
"Dude • Stud 2 • Influence 3 • Cost 9 • Upkeep 2 Abomination • Experienced 1 • Huckster 3 If your outfit is [The Fourth Ring], Ivor's cost is reduced by 1 for each Abomination in play and in any Boot Hill. React: After Ivor enters play from your hand, play up to two hexes or abominations from your Boot Hill. Reduce those cards' cost by 3 each."
This errata means Ivor will only be able to bring back cards when played from your hand, cutting back on some of the recursive shenanigans that could be done with him.