Asher, Smart But Not

Whenever you roll a die, you may pay {1}{R}{R}{U}{U}. If you do, transform Asher. Whenever Asher enters or attacks, roll a D20. 1:you can’t cast spells until the end of your next combat step 2-9: each opponent creates a treasure token and a clue token 10-19: copy the next instant or sorcery spell you cast this turn 20: until end of turn, instants and sorceries you cast have storm.