This Golgari cards a mana generator, graveyard hate, direct damage and lifegain all on a body that can hit the field turn one
It also helps tie things together, transforming both old and new werewolves at the same time
The cards chosen also do a good job of capturing Karlachs strengths and personality
An example is Esper Valigarmanda, which is a Red card with 3 power and toughness, and a set of effects that will progress over time, like usual saga cards
For example, 3: Do one damage to any target , would mean that for three mana (of no particular color), you could do one damage to any target
For example, if you control Hugs as well as Exploration (an enchantment with "You may play an additional land on each of your turns."), you'll be able to play three lands during each of your turns