1. Timing is Key:
* Simultaneous Effects: If both monsters activate their negation effects at the exact same time, the effects often cancel each other out. Think of it like a simultaneous "no!" from both sides, resulting in a stalemate.
* Chain Links: In some games, effects are placed on a "chain" in the order they were activated. The last effect activated in the chain often takes precedence.
2. Specific Card Effects:
* Specific Negation: Some cards have very specific negation effects. One card might negate monster effects, while another negates spells. If the effects are targeted at different things, they might both still work.
* Continuous Effects: Some cards have continuous effects that negate things. These might clash with other continuous effects, or they might overwrite each other depending on the game's rules.
3. The "Negate Effect" is Specific:
* Some cards say "negate the effect" or "nullify the effect". These are fairly broad and will likely cancel out the opponent's monster effect.
* Other cards will have more specific language like "negate the activation of..." or "negate the effect of... ". These may only prevent the monster from activating its effect, but not stop it from negating yours.
Example Scenarios:
* Scenario 1: Monster A (your monster) has an effect that negates all monster effects. Monster B (your opponent's monster) has an effect that negates all monster effects. This is a stalemate. Neither monster's effect will work.
* Scenario 2: Monster A (your monster) has an effect that negates spells. Monster B (your opponent's monster) has an effect that negates monster effects. Both effects can work because they target different things.
* Scenario 3: Monster A (your monster) has a continuous effect that negates all monster effects. Monster B (your opponent's monster) has a continuous effect that negates the effects of all monsters with the same name. Here the outcome depends on the game's rules and if the cards are the same name or not.
To determine the exact outcome, you need to look closely at the wording of the specific card effects you're dealing with.
Remember, card games are complex and have a lot of rules and exceptions!