Oracle

Sorcery 

Mizzium Mortars deals 4 damage to target creature you don't control.
Overload 3RRR (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")

Tournooi-info

Legal in: Vintage, Legacy, Modern, Commander

Officiele rulings

4/15/2013
If you don’t pay the overload cost of a spell, that spell will have a single target. If you pay the overload cost, the spell won’t have any targets.

4/15/2013
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.

4/15/2013
Note that if the spell with overload is dealing damage, protection from that spell’s color will still prevent that damage.

4/15/2013
Overload doesn’t change when you can cast the spell.

4/15/2013
Casting a spell with overload doesn’t change that spell’s mana cost. You just pay the overload cost instead.

4/15/2013
Effects that cause you to pay more or less for a spell will cause you to pay that much more or less while casting it for its overload cost, too.

4/15/2013
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.

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