Arel, Unseen Whisperer

Whenever you cast a creature or instant spell, you
may pay that spell's mana cost. If you do, create a
token that's a copy of it if it's a creature and copy
it if it's an instant. You may choose new targets
for the copy.
Ferocious: If you control a creature with power 4
or greater, Arel has hexproof and "whenever you
cast a noncreature spell, Arel gets +1+0 until end
of turn.