Target 1 "HERO" monster you control; send it to the Graveyard, also, after that, if it left the field by this effect, Special Summon 1 "Masked HERO" monster from your Extra Deck with the same Attribute that the sent monster had when it was on the field (its original Attribute, if face-down).
Being a Quick-play spell gives you lots of timings to activate this card.
Requires a Hero monster on the field to activate, otherwise a dead card in your hand.
A Hero can only change into a Masked Hero of the same attribute.
(This OTK is only possible because of a bug that doesn't half Anki's attack when he attacks directly with his effect and Titan Showdown is active.) Use Cosmic Cyclone to banish a spell/trap card and reduce your LP to make Titan Showdown active, then used masked change to special summon Masked HERO - Anki. Anki is able to attack your opponent directly and because of Titan Showdown he will deal 5600 damage. If your opponent does not control any spell/trap card for you to use Cosmic Cyclone on, you can turn on self-chain. First activate Masked Change on your HERO and then use Cosmic Cyclone on Masked Change, you will still be able to summon Anki with your LP reduced for Titan Showdown.
You can use Masked Change on an Extra deck Masked Hero you control to special summon another copy of himself from the Extra deck. Use this during the battle phase to gain extra attacks. Masked Hero Anki can do this most efficiently. Attack with your DARK Hero monster, activate Masked Change to special summon Masked Hero Anki and then let Anki destroy a monster. Anki will let you search a Masked Change from your deck, which you can use on him to special summon another Anki ready to attack. Repeat till your opponent runs out of monster.
Here is a list of masked hero monsters that can be summoned with Masked Change.
Drilldark lets you special summon another monster when it's summoned, this can let you use Mask Change on one of them without leaving your vulnerable to cards like Enemy Controller. Use Drilldark's effect to special summon Destiny HERO - Celestial so you can use its effect when it's in the graveyard. Vyon can also be pretty good since you can use its effect to send Destiny HERO - Malicious from your deck to the grave, then activate it from the grave to special summon another Malicious from your deck, which thins your deck as well as letting you use Mask Change using your deck as a resource.
Decider's effect lets you return a Destiny HERO monster from your grave at the end of the turn. This can let you use Mask Change on him after he attacks to return Decider back to your hand at the end of your turn.
I feel like we might get Dian eventually. (I'm actually surprised we got Anki before it.) Divine Wind would be interesting. It's better than the three we currently have, but you'd have to use Avian since there's literally 2 non-Fusion WIND Heroes. (The other being Stratos, who I doubt will ever be player-obtainable.)
The only masked heroes i think would be too powerful are acid, dark law, and koga (blast might be a bit too much, but at least he has low stats and reliance on avian). I could see the other ones getting added to the game at some point.
The fact it doesn't target doesn't in itself make it go after something else. A card like Floodgate Trap Hole doesn't target, either, and only goes after a specific card. But in this case, Widespread Ruin doesn't even "pick" until it resolves. Aside from them requiring an Attack Position monster to legally activate it, what they have at that time has no bearing on what will be destroyed.
Why isn't possible to chain "Wall of Disruption" with this card? Example: The opponent attacks, I skip "Wall of Disruption" activation, then he uses "Mask Change". After its activation, the game doesn't ask me if I want to activate "Wall of Disruption".