Priority not given with relevant mana ability available
The game does not give priority when not on full control when your opponent plays a spell, even if there are several relevant abilities like Mox Amber or Phyrexian Tower. To reproduce: 1)Play a mox amber and a legendary creature.
2. Let the other player remove it from the field(spells like Stern DIsmissal for example). Now when not in full control the game returns the creature to hand without giving you the option of activating mox amber, even though the player with the possibility to activate this mana ability should receive priority. When you dont want to add that for all mana abilities, here are some important ones:
I had this same issue. When I have a Jaspera Sentinel and Magda, Brazen Outlaw on the battlefield, I am not given a choice to react when an opponent casts a spell, unless I can cast a spell.
One relevant example is removal being used on Magda, Brazen Outlaw. If I cannot cast a spell, I do not receive priority, and thus cannot tap Jaspera Sentinel and Magda to create a treasure token in response. Magda dies without being able to react. The treasure token becomes very relevant in matches.