Mana Manipulator

At the beginning of your upkeep, you may pay {x}. If you do, add {x} mana in any combination of colors to your mana pool,
where {x} is the number of spells cast last turn.
{t} , Target player adds one mana of any color to
their mana pool.
"Bend the forces of nature to your will, and the
very essence of mana shall obey."