Tajic, Legion's Valor still conjure cards even if it has -1/-1 counters on it
I have a Hapatra Brawl deck and I just played against a Tajic deck. My board had Hapatra, Yawgmoth and a few more things, while the opponent had Tajic, Warleader's Call and other things. My strategy was to put -1/-1 counters on it so I could prevent new cards being conjured. I could put 1 counter without killing it because of the anthem effect.
This is the rule on how -1/-1 and +1/+1 counters interact: "122.3. 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 as a state-based action, where N is the smaller of the number of +1/+1 and -1/-1 counters on it. See rule 704."
The thing is that Tajic still conjured cards. The +1/+1 counter was put on it, the ability triggered, and only after the card was conjured that the counters cancelled each other. Based on the rules above the counters should cancel each other before the card being conjured. Thankfully I still managed to win but the conjured cards almost killed me
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Rezzahan#77802 commented
That rule is a state based action, which are not checked during the resolution of a spell or ability, only afterwards. Tajic gets the counter and conjures the card all DURING the resolution of the ability. That's why he has a +1/+1 counter on him when the check for which card to summon is made.