Riven (Epic)

When I become exhausted, choose one that hasn't been chosen this turn —<ul><li>[Buff] me. (Give me a +1 :rb_might: buff if I don't have one.)</li><li>Spend my buff to [Stun] an enemy unit. (It doesn't deal combat damage this turn.)</li><li>Spend my buff to ready me.</li></ul>