Either way, you really need to capitalize on those +1/+1 counters, so I suggest you start with our articles on bolster, outlast, and adapt
-sigh- Commanders emphasis on color identity in deckbuilding has successfully kept Krrik, Son of Yawgmoth from being a huge problem in the format as a whole, but its still a powerhouse that should be removed or countered on sight against decks with a large or exclusive emphasis on black, as 4 mana can easily become as much as 16, more if life gain enters the equation
Much of its card draw is tied to creatures and Beast Whisperer does a fantastic job of drawing plenty of spells
One of the best parts of Ludevic, Necro-Alchemists ability is that it doesnt specify combat damage, so spellslinger commanders, burn decks, or life drain decks have just as much chance of getting extra cards with this partner in play as more combat-heavy builds
Enchanted creature gets +2/+1 and cant block