Young wolf and strangleroot geist are early attackers against control / midrange and early blockers against aggro. Undying works well with the guildmage, biomancers, tracker, and peel. I have no problem with the biomancers negating the undying when casting them late game because at that point I'm either getting a 3/3 for G or a 4/3 haste for GG.
Wolfir avenger's flash is nice in the early game, letting me keep mana open for a peel or counter if needed while acting as a surprise blocker against more aggressive decks. The regeneration is great when paired with the tracker, as it lets me clear out difficult threats like nighthawks, flipped mayors, thragtusks, and the occasional hellrider (if I somehow still have a tracker left) without losing my guy. A rancored avenger outfights almost everything with regeneration protection.
Peel from reality has been surprisingly good. Against aggro, it lets me reset undying while blocking one guy and bouncing another. In the late game it allows me to bounce an early creature to replay with biomancer support or acts as a counterspell for creature removal. I was worried at first that this card might just be a little too cute but it's honestly been an absolute house. I wish I could run more than four. There's nothing quite like countering an uncounterable abrupt decay while sending a pumped lotleth back to their hand.
Zameck guildmage should be pretty self-explanatory, but it's kind of good with undying and biomancer counters. With all the aggro running around right now, an early wolf or geist with guildmage support is a hell of a wall to break through and gives constant card advantage while doing it. Against control he helps me dig for my counters and finishers.
Wolfir silverheart is BFF with master biomancer, ulvenwald tracker, rancor, and spell rupture. He's just a nice top of the curve who helps everyone do their thing.
I like the look of simic charms, but I think they'd be best in the sideboard. Most of the time peel will do what the charm will while throwing in a free unsummon. It's great against RDW (stops flames of the firebrand in game two and bounces pyreheart / hellrider before combat without compromising my blockers) but I don't think it's mainboard material. I haven't playtested enough to nail down a real sideboard yet.
