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That isn't all Leyline does, by the way

There is also a mini Dragon tribal theme in the deck with some board disruption spells to destabilize your opponents

Populate makes a copy of an existing token, letting you take that 1/1 copy and turning it into three, four, or even more of them with minimal work

Helix Pinnacle's triggered ability has an "intervening 'if' clause." That means (1) the ability won't trigger at all unless Helix Pinnacle already has 100 or more tower counters on it as your upkeep begins, and (2) the ability will do nothing if Helix Pinnacle has lost enough counters such that it has fewer than 100 counters on it when the ability resolves

Essentially, while the red aggro deck's win-rate was only just above 50%, it seemed to be too format-warping in how much it dictated players' sideboarding choices