Blighting creatures with +1/+1 Counters is broken
Blight against +1/+1 counters is broken. When blighting, a player is supposed to add -1/-1 counters. If the player selects a creature with -+1/+1 counters, the counters end up not existing, even though there should be both -1/-1 AND +1/+1.
This causes headaches if you go to proliferate the -1/-1 counter, because it suddenly doesn't' exist.
This extends all the way to ANY interaction which adds or removes -1/-1 counters.
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Rezzahan#77802
commented
+1/+1 counters and -1/-1 counters annihilate each other one for one as a state based action. They are ways to remove the other. This has been the case since at least the great rules overhaul for 6th Edition in 1999.
704.5q If a permanent has both a +1/+1 counter and a -1/-1 counter on it, N +1/+1 and N -1/-1
counters are removed from it, where N is the smaller of the number of +1/+1 and -1/-1 counters
on it