Lady Olenna Tyrell

Queen of Thorns - Whenever Lady Olenna becomes the target of an opponent’s spells or abilities, if you are the monarch, you may
pay {1}{u} to counter that spell or ability and
that opponent creates a 3/3 white Knight creature token that is goaded.

{2}{u},{t}: Proliferate

“ Why, she's just the littlest bit of a thing. There was nothing the least bit thorny about her.”