Toju, Power From the Depths

{t}{p/u} Target Creature is unlockable this turn
{t}{p/b} Target creature gains This creature gets +3/+3 for each Creature attacking
{t}{p/b}{p/b}{p/u}{p/u}{6} Target creature gains This creature gets 10 +1/+1 counters for each Creature attacking alone this combat
Partner with Slick of the Black Market