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As soon as Decimator Beetles ability resolves, state-based actions are checked, and the game sees that you have both counter types on your Servant, so one +1/+1 counter and one -1/-1 counter are removed at the same time (resulting in Servant dying)

Now, the issue with Novablast Wurm is that it kills your own stuff too, but given its powerful board presence, that's an acceptable consequence of the card

A quick hit of Chaos Rising with a Toxel promo up front

Read More : The 12 Most Rare and Expensive MTG Cards of All Time 3 Mirrodin Besieged Mirrodin Besieged is a three mana Blue Enchantment that has two different modes