An overloaded Dynacharge affects only creatures you control at the time it resolves. Creatures you begin to control later in the turn wonâ€™t get +2/+0.
Overload doesnâ€™t change when you can cast the spell.
Note that if the spell with overload is dealing damage, protection from that spellâ€™s color will still prevent that damage.
If you donâ€™t pay the overload cost of a spell, that spell will have a single target. If you pay the overload cost, the spell wonâ€™t have any targets.
If you are instructed to cast a spell with overload â€œwithout paying its mana cost,â€ you canâ€™t choose to pay its overload cost instead.
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.
Casting a spell with overload doesnâ€™t change that spellâ€™s mana cost. You just pay the overload cost instead.
Because a spell with overload doesnâ€™t target when its overload cost is paid, it may affect permanents with hexproof or with protection from the appropriate color.
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