Forum:Egyptian God cards vs. A-counters

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I want to know if an egyptian god card like Obelisk can be affected by A-counters. Example: I have Alien Overlord and Alien Mars on my field and he has Obelisk The Tormentor. I activate Overlords effect and put 1 A-counter on all monsters on his side of the field, then Alien Mars effect kicks in and Obelisks effect is negated.Is this possible or does Obelisk negated this chain.