Symbol of Divine Envy

{5},{t}: Add one envy counter on
Symbol of Divine Envy.
{t}, When there are 20 or more envy counters on
Symbol of Divine Envy, sacrifice Symbol of
Divine Envy, deal 20 damage to target opponent,
damage cannot be prevented from this ability.
Whenever a opponent attacks with 3 or more
creatures, put a envy counter on Symbol of
Divine Envy