Electro, Powering the Grid

Electros power is equal to the number of Instant
and Sorcery cards in your graveyard.

If Electros power is greater than or equal to 10, he
gains Hexproof.

High Voltage - Whenever an opponent casts a noncreature spell, roll a D20. If the result is less than Electros power, Electro deals damage equal to his
power to that opponent.