It gives us a sticky threat that is immune to sorcery-speed wipes like Deadly Cover-Up and continues to pressure the opponent even after our hand is empty
Countering creatures is great, but countering non-creatures is usually good enough, and this doesnt require another blue card and doesnt cost an extra resource
Consider playing 5-color mana sources like Blitzball and Capital City alongside this for more options though
Man-o'-War (Mirage/Visions/Weatherlight) Undo and Man-o'-War were often seen together in packs, and players debated which was better: the sorcery which took out two creatures, or the 2/2 creature which took out one
A creature's persist ability can bring it back again if its -1/-1 counters are removed this way
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