Lunar convocation interaction with unholy annex
The game auto-sorts lunar convocation to resolve after unholy annex. When you manually sort ability’s (to lose life from unholy annex first before lunar convocation resolves), the second effect from lunar convocation fails to summon the 1/1 bat creature. Life was gained during the turn. Multiple tests with this interaction result in the same outcome.
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Rezzahan#77802
commented
Lunar Convocation's end of turn triggers have intervening-if clauses. This means, that the condition has to be true at the time the ability would trigger. If it is not, no trigger. In short, the condition must be true before the end step begins. Think of it as an extension of the trigger condition. Unholy Annex cannot make tnhat happen with its end step trigger, since losing life in the end step happens too late.