- The effect to send this card from the field to the Graveyard can be activated during your Main Phase only. Sending it to the Graveyard is a cost.
- You cannot activate Wattcube and activate its effect to send this card to increase 1000 ATK in the same Chain. This is a Spell Speed 1 effect, you cannot Chain the effect of 2 Wattcubes to each other.
- The effect of "Wattcube" which increases ATK by 1000 can only be activated during a Main Phase of your own turn.
- Sending "Wattcube" from the field to the Graveyard is a cost to activate its ATK-increasing effect.
- If you send "Wattcube" to the Graveyard to increase the ATK of a Thunder-Type monster, then the monster's ATK remains increased as long as the monster remains face-up on the field.