Turning all the 3-mana counterspells like Disallow and Dissipate into Counterspell with upside and discounting your instants and sorceries gives you ultimate control in a game where you decide who resolves, who doesnt, and whose story is told
Shortly after Henzies launch, the rules were updated to specify that Effects from static abilities that give a permanent spell on the stack an ability that allows it to be cast for an alternative cost continue to apply to the permanent that spell becomes or, more simply, the resulting permanent from the spell has blitz
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Theyre bad because they just recur copying the spell and untapping, without accruing any additional value
As your Horrors and Squirrels arrive to the battlefield you can make double
If you can get this card and your board rolling, it becomes quite hard to stop