Two of my favorite on this card are may which gives you an option not to discard, and permanent which also gives you lots of options for things to untap
Vorinclex, Monstrous Raider Id love to slap Doubling Season on a stick
Or Champion of Lambholt to give it a bunch of counters and making all your creatures unblockable
While they dont undergo quite as radical of a transformation as werewolves do, they do become more powerful at night, and they also get stronger the longer they live
As such, Explorer is fun as a stand-alone format, and also makes for effective cross-training for Pioneer players
Bell Borca, Spectral Sergeant and Umbris, Fear Manifest are secondary options that become substantial threats as we exile more and more of our opponents cards