Nothing evens the odds like a little lightning.

Dynacharge

Target creature you control gets +2/+0 until end of turn.
Overload {2}{R} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

The List

Modern Masters 2017

Target creature you control gets +2/+0 until end of turn.
Overload {2}{R} (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")

Return to Ravnica

An overloaded Dynacharge affects only creatures you control at the time it resolves. Creatures you begin to control later in the turn won't get +2/+0.

Because a spell with overload doesn't target when its overload cost is paid, it may affect permanents with hexproof or with protection from the appropriate color.

If you are instructed to cast a spell with overload "without paying its mana cost," you can't choose to pay its overload cost instead.

If you don't pay the overload cost of a spell with overload, that spell will have a single target. If you pay the overload cost, the spell won't have any targets.

To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as an overload cost), add any cost increases, then apply any cost reductions. The mana value of the spell remains unchanged, no matter what the total cost to cast it was.