This is to 2x Charisma what On Your Own (3) is to On Your Own (6), though at a 4xp discount. If you have to buy Relic Hunter that makes it even less worth it, since the total xp cost would be 5xp vs 6xp .
The discount on play usually would only breakeven its own play cost, unless you're playing a lot of disposable survivor creatures. Calling in Favors can double-dip on the discount.
You can get this on top of Charisma, though very few decks actually want to be this ally heavy and have all the allies in play simultaneously. Even disposable survivor allies don't stay in play for long
Few Sled Dog decks want to play even more allies due to the action/resource intensive nature of sled dogs, so the extra slot over 1x Charisma may be wasted, and it adds less reliability and more action/card tax in an already strained build.
This decent enabler for thematic decks running Raven, Cat, and/or Dog (Patrice and Yorick comes to mind), although even many such decks would be a lot more reliable with Charisma unless they desperately need the saved XP, or are just running that many allies.