CassZero, Bargain Mage

Whenever you cast an instant or sorcery spell,
if no mana was spent to cast it, copy it. You may
choose new targets for the copy.
Whenever a non-token creature enters the
battlefield under your control, if it wasn't cast
or if zero mana was spent to cast it, put two
+1/+1 counters on it.
"There's no better price than free."