Despite being bizarre otherworldly beings, the
Eldrazi who involve colored mana do things that
are remarkably similar to their colors in other
sets. That was me being a little sarcastic, but
they're actually no more or less useful than
such effects, and still worth your time. For
example, there are plenty of decks that can make
good use out of a miniature Reaper of the Wilds,
as this kind of card quality advantage adds up
over time, in the time-honored tradition of the
Rock or Jund. Plus, there's probably at least
one combo involving said tokens (plus their
counterparts from Rise of the Eldrazi) that can
let you scry your entire deck in one turn.
This is a pretty impressive creature for the
price. Usually creatures that come with tokens
are small for their cost, with the understanding
that the total sum of power and toughness you
get makes them worth it. But a 2/3 for three is
nothing to sneeze at normally, especially when
you not only get an extra 1/1, but you also get
an extra colorless mana to be redeemed later,
and a Scry 1 trigger whenever another creature
dies (which you can trigger by redeeming that
mana). A lot of internal synergy, and a lot of
utility in any creature-based deck.