Colossal Toxin Dragon

Flying, deathtouch
When Colossal Toxin Dragon enters the battlefield, return any number of permanents
with total mana value X from a graveyard to the battlefield where X is equal to the number of
swamps on the battlefield.
{b}{b}{t}: Destroy target non-Dragon creature.
When Colossal Toxin Dragon dies, each
opponent discards a card.