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They do gain a Primal Being Token with the Attack Power of all tributed monsters, but one monster is easily dealt with

How well you make them fit your deck is up to you

Poison Counters can be placed on opponents and then proliferated with this card, taking players out of the game in a short handful of turns

Not all of the new Doctor Who cards care about Time Counters, either on suspended cards or on permanents you control, but it seems like a really fun direction to build in and a great way to make the most of your own wibbly-wobbly, timey-wimey Doctor Who Commander deck

Keeping them separate from your regular cards and in a secure location is also a good idea