Just had a arenagame where i get a paladinweapon “selestial inc set”. On my Turn 8 (see replay) i have one Mana left to activate the weapon.
Now my openent plays a spell and MY weapon triggers…
See Replay Turn 8: https://replays.firestoneapp.com/?reviewId=3806f5d6-eb7c-43f3-bb36-34ab71e1f18f&turn=0&action=0