Reservoir Kraken and Solitary Sanctuary - who taps?
The text of Reservoir Kraken reads, in part, "any OPPONENT may tap an untapped creature they control". The text of Solitary Sanctuary reads, in part, "whenever YOU tap an untapped creature an opponent controls." Emphasis mine in both. By my reading, a player who controls both should not have Solitary Sanctuary trigger when an opponent taps Reservoir Kraken, yet the Arena rules appear to work this way - my opponent was given the option to place counters on his creatures apparently in response to me electing to tap a creature. I suspect that the implementation of Reservoir Kraken incorrectly identifies the tapping player, causing Solitary Sanctuary to trigger when it shouldn't.