This attribute boost completely warps the resource math of a match, transforming low-cost characters into highly dangerous offensive threats
The reason that people are not playing with Heros Downfall as much as they probably should be is that the 1BB mana cost is extremely taxing on a mana base that also wants to have 2UU for Jace, Architect and 1UWW for Supreme Verdict on turn 4
You may even want to bring along a stack of lands, or similar, to serve as a proxy for your opponents deck entirely
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So we took some learning from that
Just like Attune with Aether before it, draw Sami's Curiosity on turn one and you'll be just fine