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I very recently talked about the problem with Infect in Commander

You can chump block, then Saw in Half your about to die blocker and then get two copies for future blockage, which I like in planeswalker heavy brews to get three blockers from one removal spell

This means that you can fit split second cards into virtually any deck , either as a backup for a spell that you need, or as an alternative that your opponents can't deal with

In a format where everything was speed, speed, speed, Capsize single-handedly allowed blue to stay in the game, and eventually lock it up by returning two lands a turn to a hapless opponent's hand