Cameron, Conniving Caster

Cameron, Conniving Caster enters the battlefield
with a +1/+1 counter on it equal to the amount
of mana spent to cast this spell.
Whenever you cast an instant or sorcery spell you
may remove any number of +1/+1 counters from Cameron, Conniving Caster, if you do copy that
spell for each +1/+1 counter removed this way,
you may cast those copies without paying their
mana costs.
{p/u}{p/r}{2}: Put a +1/+1 counter on Cameron,
Conniving Caster