Carcharodon, The Pirate King

Islandwalk, Swampwalk, First strike
{u}: Roll a six sided dice, on a 4+ counter target spell.
{b}: Roll a six sided dice, on a 4+ destroy target creature.
{u}{b}{x}{t}: Take control of target permanent, where it's converted mana cost is equal to the {x} amount of mana paid.