Favor of Eshu

You still need a resource match, so it's not necessarily easy to use it to gobble up your opponent's resources.  Further, a disproportionate number of resourced cards could be high cost which you may not be able to afford even if you have the appropriate resource match.

For it to get restricted it will need to either need to have a killer interaction with an existing restricted, or it will need to find a "partner" to get restricted with it, that together create an unstoppable combo.

This card, by itself, is not restriction worthy as simple support destruction is an effective counter.

How about a combo with Festival?  Allows you to search for cards you want to play with Festival and put them into the domain with Favor.... be interesting to see how this would work.  But if it seems as strong as I think...?

FAQ 4.1

Favor of Eshu (F29)
Should read, “Attach to a domain you control...”

From http://www.cardgamed...ew-part-2-r1370
 

BanalityBob - 4/5 - Oh look, another card that makes The Festival even better. Favor of Eshu is a decent draw engine and funny trick to play on an opponent’s domain, but with The Festival in play, it is a draw and tutor engine like no other, and let’s be honest, if you’re playing Shub, The Festival is probably your restricted card. This will have a huge impact on the game.
Danigral - 4/5 - Even without the cool Festival combo, this is great late game card advantage when your deck is tanking out and top decking. Most Shub decks only need to build up to 5+ resources just to play that one fatty once, and the rest of the game are overpaying. This lets you turn over-resourced domains into a second, safer hand, and has cool implications for early game resourcing too.
dboeren - 4/5 - Of course everyone dreams of burning down their opponent’s big domain by attaching it to their domain but you’ll only have a faction match maybe 1/4th of the time so don’t rely on it. I could easily see this getting an errata to only work on your domains too but for now enjoy it. It’s especially good later in the game when your hand is small or you have enough ramp/discount that you may not need big domains anymore.
Kamacausey - 4/5 - This card alone will create new deck types and that is enough to warrant the rating on its own. However, the versatility that this card provides of being able to play your cards or your opponents, providing you have the resource match, is awesome. Late game you can apply it to your own domain and use it as an extension of your hand to get back useful cards. The only drawback is the fact that it's an attachment support card and therefore is easily dealt with. Overall though I give it two thumbs up!
mnBroncos - 4/5 - This is only a 4 while it can be attached to an opponent's domain if that wasn’t the intent and missed being caught in editing and get a quick errata this is a 3/5. It is card advantage though and could actually still be a four when play it on your own domain. I do think if you can put this on opponents though and have matching icons you can do a lot of damage to your opponent. At worse though late game you have a virtual bigger hand at the cost of long term resources.
Reckoner - 4/5 - This is a really powerful card, much better than Ghoul Tunnels. It makes one of your domains an extension of your hand that cannot be targeted by discard effects like Greatest Fear and gives you amazing tutoring power with The Festival. I would not be surprised if this is at some point limited to only it’s owner’s domains, but even then this is the fixed version of Twilight Gate. If this is not limited with a FAQ entry, then it can even form the basis of a prison type deck that eats up an opponent’s domain.