Sphere's of Annihilation

Pay {x}{r} Mana deal x fire damage. or,
Pay {x}{g}Mana gain {x} life. or,
Pay {x}{u}Mana Gain control of target creature where {x} is the creatures toughness. or,
Pay {x}{b}Mana Deal x damage to target creature where {x} is the creatures toughness. or,
Pay {x}{w}Mana destroy target land.
"Choices, in life are at times tough."