I am trying to figure out the difference between the effect of a +x/+y Counter and the effect of +x/+y. I was under the impression that a counter increased (Or decreased) by the value of X/y each turn... Can someone please clarify?

Counters remain after the turn ends whereas the spell effects typically do not. So, for instance, if you cast Hunger of the Howlpack it places a +1/+1 counter on the creature, permanently pumping its power and toughness. But if you were to cast Giant Growth, its power and toughness both are boosted by three (+3/+3) but at the end of the turn, that effect expires and the creature returns to normal.

Does that make sense?

That makes perfect sense! My wife and I have been arguing this for days!!! She was right! :lol: