I think this guy has always suffered a little in
assessments, but only because people don't
always associate black-green decks with having
lots of creatures. We sometimes expect those
colors to adopt a more attrition-based
Rock-style strategy; while such strategies do
sometimes benefit from repeatable creature
generation, they have historically turned to
other sources to get it. Still, it's worth
remembering that Thallids are (in the Modern
card pool at least) centered in green and black,
and that there's no shame in including this card
in an appropriate mono-colored deck that uses a
suitable strategy.
Today's card of the day is Creakwood Liege
which is a four mana Black or Green 2/2 that
gives other Black and other Green creatures
+1/+1 each and at the beginning of your upkeep
you put a 1/1 Black/Green token into play.
While somewhat weak by itself the production of
tokens at 3/3 and working extremely well with
multiple copies makes this a strong supporter in
a dedicated Green/Black build.
There's little reason not to run this in a
Golgari build as being a lord with potential
+2/+2 to offer and adding tokens is quite a bit
of value at four mana.
One of the infamous hybrid lords from Lor/moor
block, a +1/+1 boost to mono colored creatures
is good, a +2/+2 to multicolored creatures is
huge, plus creating creatures that are
essentially 3/3's each upkeep is pretty great
too. Sure, it dies to lightning bolt, but if
you're playing multiples (and this is one of
those cards you play a set of or none of), it
can easily get out of burn range. All around,
for aggressive decks, it's pretty great.