Dolan, Knights of Requital

The first historic spell you cast each turn has
convoke. (Your creatures can help cast it. Each
creature you tap while casting it pays for or one mana
of that creature's color.)

"Well, the system's too big for us to deconstruct from
the outside. I could hope to improve it from the
inside. The lawmaster is a good woman; there are
good people in there. But if we root out the
cancers, the tumors, that threaten to make it what it
is, that's something."