Head of Soo Line

At the beginning of your upkeep, pay {3} for Head of Soo Line. If you do not, sacrifice Head of Soo Line.
At the beginning of your precombat main phase, create 3 red and white 2/3 GP30 creature tokens with "When this creature dies, add {1} to your mana pool. This mana does not empty as turns, steps or phases end."