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I would still opt to include Arbor Elf over Llanowar.

-Provides same amount of mana
-Provides more mana when land has a sprawl attached to it
-Allows Squirrel nest to be used x2 a turn

WotC...

Concordant crossroads ?

I mean making infinite tokens is cool, but it should let you win on the spot rather then giving your opponent another turn to whipe the board. (At least thats how I see...