Yes, but the key thing to understand is you can control their draw as well as your own using the eternities/rewinds. For example, if I was playing against a mono life rush or something, as soon as I mindgated a pillar I'd use all my mindgates and then rewind a creature. The next turn, the pillar would still be at the top since the creature took its place the last turn, so I'd again use all mindgates then rewind. I would do this until I have a decent number of pillars/quanta, then I'd do the same thing except I would rewind whatever creature I want of theirs, then use the mindgates to take it (rewind puts it at the top of their deck, so in mindgate spot). The same thing would apply to useful spells/perms that you do with pillars, so for example if they have an SoD at the top, you'd take as many as possible then rewind to do it the next turn, and after a not very long time you can have huge amounts of hp.
Edit: Just to add, you do need to be careful if you take SoG's/other perms as you dont want to take up all your permanent slots if you dont have at least 4+ mindgates out yet.
