Delina, Wild Mage

Whenever Delina, Wild Mage attacks, choose target creature you control, then roll a d20.

1 - 1 4 • Create a tapped and attacking token that's
a copy of that creature, except it's not legendary
and it has "Exile this creature at the end of combat."

1 5 - 2 0 • Create one of those tokens. Roll again.