Shadow Dragon

When played, gain {e}{e}{e}{e}{e}{e}{e}{e} (eight energy counters). When Shadow Dragon blocks, gain {e}{e}{e}{e}{e} (five energy counters).
{e}{e}{e}{e}{e}{e}{e}{e}{e}{e} When Shadow Dragon attacks this turn, add up the power and toughness of all creature on the battlefield, Shadow Dragon gains that much power.
{e}{e}{e}{e}{e} Shadow Dragon cannot be hurt for 3 turns. Shadow Dragon deals 8 damage to target creature, player, or planeswalker. If the damage is dealt towards target creature, that creature