Unlike many higher hitting stuff you don't have to hold out mana or keep something untapped like a dork or a land, you can just do your thing and then keep the Chains ready
Whats more, EDH decks these days have many legendary creatures, and for those, its even better as you get rid of said problems for a couple turns
Wizards of the Coast has also been pushing the boundaries of the mechanics they created recently
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Rating: 2/5 Merlin - Crab We've seen the cards that do the bouncing, now we look at the cards that want to be bounced
Those are my only criticisms, though Phyrexian Tower is just plain good in any deck that wants to sacrifice creatures, which tends to be most black decks