Quote Originally Posted by TheInfamousBearAssassin View Post
Like, first of all? Fetchlands don't let you see another card. Already you're throwing your logistical credentials out the window.
But fetchlands do let you see more cards, since Brainstorm is probably the one of most played card in Legacy (actually, 2nd most, right behind FoW, according to DeckCheck). Brainstorm/Fetch lets you see 2 additional cards (or like 1.9 something cards if you calculate probability) compared to Brainstorm itself. That's what I'm assuming emidln means, because that's the course of action that tends to happen, brainstorm/fetch.

Secondly, I asked about the likelihood of drawing 3 out of the 4 copies of a spell. You talked about seeing 2. This distinction is relevant, since your argument was that Extirpate could strip multiple Forces. But this scenario means that one Force has to be in the yard, and two in hand. Conversely, with Therapy, you can strip two Forces simply by their having drawn two Forces.
Why the triple FoW? 2 FoW, 1 in hand, 1 hidden can do alot to disrupt the FT strategy. Extirpate gets rid of the hidden one (or the extra one in hand). Why does there need to be 3 FoWs? I don't think I've ever got 2 FoWs out of my opponent's hand so far, since all I really want to do is resolve Chant, and Extirpate lets that happen easier since it's got the Split Second clause and it usually disrupts 1 for 1 and gets in a free Peek.