Why don't you think about the question like this: Which decks you play against do you feel very, very comfortable giving free cards to? Burn? Who in their right minds would give cards to a burn deck unless they had to, absolutely had to? Necro? Isn't one of the main goals of playing against this archtype with permission is to keep necro off the table, denying them much needed cards? Keeper (5C Control)? My God, they already draw too many cards, why take the chance that one of those cards could be that amnesia, Ancestral Recall or Timetwister which you may not be able to counter? Zoo? Like hell they need more cards to abuse us with. Even if we CAN counter many of the threats, they still have more coming. Combo? More, absolutely free cards are a combo deck's dream, even if they lose one copy of a key card. Rogue Decks? This is where it gets odd. Some decks, it isn't too bad to give them cards, they already have a pace at which they must work. Others, who knows what the hell they are gonna pull out of that stack of cards? Sorry if I forgot anyone's personel favorite decktype, it wasn't intentional Basically, out of the 3 basic resources in magic, cards are the most expensive and useful ones (otherwise, why would Ancestral Recall be so damn expensive?) Why should we give someone a mini ancestral when they don't pay for it at all? Has anyone thought of using Rethink instead of Arcane? It costs one more but still has the 1 blue in the CC. It becomes very, very useful in many situations, doubling the cc of the target spell. I hope I gave a decant arguement against Arcane Denial except in certain deck or against certain decks. Elrond, regular at the T1 and related mills at http://www.bdominia.com.