You might be wondering where Combo fits into this, as its such a large consideration in other formats metagames
Blue has some individual powerhouse cards for counters matter, able to gain card draw relating to counters or even give unique forms of evasion to your counter-wearing creatures
He'll want things like Rogue's Passage and Trailblazer's Boots to ensure he punches

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Youll already be playing a number of creatures youd be happy to untap and pump during your opponents attack step, and youll also want a large number of cheap spells to trigger heroic with anyway