Must be Special Summoned with "Mask Change" and cannot be Special Summoned by other ways. When this card destroys an opponent's monster by battle and sends it to the Graveyard: You can Special Summon 1 Level 4 or lower "HERO" monster from your Deck.
Needs to destroy a monster by battle before using search effect, which could be slow.
Masked Change is a requirement to summon any of Masked HERO monster. Luckily there are a number of ways to search out Masked Change. Aside from Masked Change you also need a HERO monster with an attribute similar to the specific Masked HERO you want to summon.