If 2 opposing players each have Vorinclex, Monstrous Raider, and one tries to put a poison counter on the other, who's vorinclex wins? The player being targeted with the poison counter will either end up with 1 or 0 counters depending how the effects stack, but how is that determined?
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When two or more replacement effects try to modify the same event, the affected permanent's controller or the affected player chooses one to apply, applies it, then chooses another from among the remaining still applicable effects and any now applicable effects to apply, applies it, and so on, until no more effects are applicable. Then the modified event happens.
So in this specific scenario, the affected player can first choose to either modify the event to get two poison counters or none. If he chooses two poison counters, the other effect is still applicable, and he has to half the counters, so 1. If he first chooses to half the counters he gets, and thus getting none, the other effect isn't applicable anymore. In the end, the affected player gets either 0 or 1 poison counters, and he's the one choosing the outcome.
So in this specific scenario, the affected player can first choose to either modify the event to get two poison counters or none. If he chooses two poison counters, the other effect is still applicable, and he has to half the counters, so 1. If he first chooses to half the counters he gets, and thus getting none, the other effect isn't applicable anymore. In the end, the affected player gets either 0 or 1 poison counters, and he's the one choosing the outcome.
(Edited to remove brain fart)
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