diff --git a/crates/game-service/src/battle_session.rs b/crates/game-service/src/battle_session.rs
index 7ec52a3..17c74c9 100644
--- a/crates/game-service/src/battle_session.rs
+++ b/crates/game-service/src/battle_session.rs
@@ -325,10 +325,11 @@ impl BattleSession {
             .position(|id| *id == account)
             .map(|index| index as i32)
     }
-    pub fn next_instance(&mut self) -> i32 {
-        let instance = self.next_instance;
-        self.next_instance += 1;
-        instance
+    pub fn next_instance(&self) -> i32 {
+        self.next_instance
+    }
+    pub fn reserve_instances(&mut self, count: usize) {
+        self.next_instance += count.max(1) as i32;
     }
     pub fn deck_card(&self, owner: i32, slot: i32) -> Option<LogicDataRef> {
         let deck = self.mode.battle.decks.get(owner.max(0) as usize)?.as_ref()?;
@@ -379,6 +380,7 @@ impl BattleRegistry {
         session.advance_to_now();
         if let Some((card, position, instance)) = session.take_bot_play() {
             let entries = summon(&card, position, crate::bot::BOT_OWNER_INDEX, instance);
+            session.reserve_instances(entries.len());
             if !entries.is_empty() {
                 tracing::debug!(card = %card, count = entries.len(), "the bot played a card");
                 for entry in entries {
@@ -457,6 +459,7 @@ impl BattleRegistry {
         let cost = card.data().map(|row| row.int("ManaCost")).unwrap_or(0);
         session.spend_mana(owner, cost);
         let entries = summon(&card, position, owner, session.next_instance());
+        session.reserve_instances(entries.len());
         let spawned = entries.len();
         session.queue(at_tick, entries);
         spawned