Dió, Weaver of destiny

Hexproof, indestructible (you can't kill the DM)
Whenever a player casts a spell, roll a d20
1-4| create a treasure token,
5-8| Your spells have Flash until end of turn
9-14| You may put a permanent card from the graveyard into your hand
15-18| You may cast a spell from your hand without paying its mana cost
19-20| Copy target spell, you may choose new targets for the copy