I used to run a power surge/manabarbs deck and I highly recommend replacing Power Surge with Citadel of Pain. Same effect only it forces opponents to tap out on their own turn (instead of at the end of yours) so they don't have mana open for counterspell type shenanigans during your turn. Also if you find the 'all creatures attack' effect of War's Toll to be overwhelming, Mana Web has a similar effect just for lands.
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