A couple of these commanders have their own fight abilities, but you can never go wrong with other fight and bite spells like the flexible Archdruid's Charm, the ever helpful triggers of Hunter's Talent, and Signature Slam to really lay the smackdown with your modified hydras
Necropotence [The Strongest Card Advantage Engine in Black] Necropotence replaces your draw step and lets you trigger an ability that pays life to set aside cards for your end step
Kodama of the West Tree, for example, grants modified creatures trample and also allows you to grab a land from your deck and put it into play when a modified creature you control does combat damage to a player
Then the duo of Slimefoot and Squee turns four mana and a saproling into a reanimated creature: this great Jund card is part of some of Jund's best combos
if it has a sword, it gets first strike
Rules 10/04/04 The timestamp for the in your graveyard ability is set at the time that this card goes to your graveyard, regardless of whether you control a Mountain at that time