Not a trick play, but a play on the ineligible receiver thing. Put Fleming on the right as a 6th lineman, Devlin announced ineligible where vereen lined up and LaFell split wide on the right. Leaves either Blount or vereen as running back.
Devlin has to step off the line and is ineligible, but he's not a receiver anyway, he's part of a three man blocking team to the right of the line. either a wr screen to lafell with Devlin and Fleming sealing off and the guard pulling to the right, powersweep with the same pinch and Blount behind three blockers pinching left, 5 pulling right, Vereen with run/screen option instead of Blount, or just run or screen gronk on the left, if they over pursue.
Don't know if anything's illegal. The idea is to have three good blockers already stationed wide, near the line and have the defense looking for the extra eligible receiver, because devlin's announced, but there isn't any.
Superioir blocking ability of lafell and Gronk creates all the run/screen oprions with all 5 linemaen free to destroy the front seven pursuit after the 3 man line, lines them up, leaving only the cb covering lafell to defend the wide screen/run options.