Loki, The Trickster

Myriad (The Myriad ability copies the copied
creature, not Loki)
Whenever a creature enters the battlefield, dies,
gets exiled, or gets returned
to a hand, you may have Loki may become a copy
of it but it has base power and toughness 4/4 and
has this ability.
{t}: Add {b}{g} to your mana pool. You lose 1 life