Wall of Roots and +1/+1 Counters

There was a time when counters didn't cancel each other out on the same permanent; you could have a bunch of +1/+1 counters and a few -1/-1 counters on a creature and they'd just co-exist happily on that creature, in case anything cared. With the Lorwyn block, that got changed up because it was a little confusing, and it also allowed you to do cool stuff like use +1/+1 counters to cancel out the -1/-1 counters from Persist, 'resetting' the creatures (or using -1/-1 counters to do the same with Undying,

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