Merry & Pippin are the best choice if you want to focus on the Food + Token aspect of the deck, as Pippin provides the Food that Merry needs to feed your growing army of creature tokens and then Pippin turns that into a hasty finisher
While it's important to note that Jerren is a double-faced card that can be transformed if its controller's life total is exactly thirteen, this transformation is quite difficult to trigger
Back when it was originally released, it was a clunky way to double your small tokens in play
Cheap Zombie threats that can then be turned into fuel for card draw and decay Zombie tokens make Wilhelt a persistent threat, one that needs to be addressed early in a Commander game lest things get out of control
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Some decks bump it up to 26 lands while others knock it down to 19 depending on how large their curve is, but the safe starting point is 24 lands which is often the average in Constructed decks