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Since you cant know which cards will be exiled with Act on Impulse, if its a land you can play it, and if its a spell you can cast it

When the planeswalker symbol is rolled, the planar controller puts the active plane or phenomenon card at the bottom of his or her planar deck

With its wealth of efficient counterspells and card draw options, no other color comes close to blues prowess when it comes to picking and choosing what spells its opponents are allowed to resolve

This is best in the decks most focused on speed but I think that it is bad enough on average and sufficiently polar in performance to really only be something you want as a sideboard option