Kalitas is a little expensive to be counted
among the traditional class of hate card: the
larger competitive formats tend to prefer those
that cost around two to three, like Thalia or
Qasali Pridemage. Yet I don't expect that to
hold him back too much, overall: graveyard decks
in Commander and similar formats tend to thrive
in the late game, and in such a setting four
mana is actually cheap to lock out Ghave's
gameplan. And did you notice that this is like
the only time where his final line doesn't
include the phrase "nontoken"? Zombie
Infestation doesn't really need much help, but
now there's at least one more thing to do with
it!