Use this to Synchro Summon "Black Rose Dragon" and switch a monster to Defense Position. You can then banish a Plant-Type monster in your Graveyard to activate "Black Rose Dragon's" effect and switch that monster back to Attack Position with 0 ATK.
This effect works well against monsters that cannot be destroyed so easily, like "Shield Wing", which has only 0 ATK.
This card's effect can destroy Cloudians with ease.
You can use this card when you attempt to Synchro Summon monsters whose attack is not very high, such as "Flamvell Uruquizas", "XX-Saber Hyunlei", etc; and with "Changer Synchron's" effect you gain a certain advantage over your opponent's monsters whose DEF is lower than your Synchro Monster's ATK. Also, as "Changer Synchron's" effect activates in your Graveyard, you can bring it with "Junk Synchron's" effect and it gains its effect.
This card can be used to Synchro Summon any Synchro Monster and have "Nitro Warrior" to activate his effect.