Rigorous Augmentor

{4}: Put a +1/+1 counter on target creature you control. Spend no more than {4} on this ability
each turn.
{1}, {t}: Recalculate 2 (Change the value of X on
target ability or change a generic mana cost on target permanent until end of turn by adding 2 to it or subtracting 2 from it. This effect can't reduce the
value to less than 1.)