This can be compared to Rhythm of the Wild enchantment from Ravnica Allegiance that gave a lot of trouble to anyone who faced it
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The reason for this is mainly that since the printing of Ragavan, Nimble Pilferer, Dragons Rage Channeler and Murktide Regent the tempo archetype reinvented itself in being primarily blue-red and making Deaths Shadow not a necessary creature for tempo shells anymore
-1/-1 Counters -1/-1 counters reduce a creatures power and toughness by that same amount
Edit: This article originally referred to the app used for match reporting as "Bandai's app"
Some forces have pushed constructed Magic towards greater consistency, including, but not limited to, the mulligan rules (and especially the London mulligan), the massively expanded card pool with many functional variants or copies of existing cards, and the greater efficiency of deck manipulation (especially with the advent of cantrips and fetchlands)