I'm not sure how long this bug has been around nor do I know whether posting trainer bugs here is appropriate.
Note that this is
only in the trainer and does not affect the live game.
Scarab's that are already in play will not maintain the effect of Swarm. That is to say the HP increase Scarabs are supposed to maintain from Swarm will only take full effect the turn they are played. If more Scarabs are played the Scarabs already in play will increase their HP at the and of the turn by the # of Scarabs played during that turn, reverting to base HP if no Scarabs are played the following turn.
Affects both Upped and Unupped scarabs.
Affects Scarab card and ones spawned through Pharaoh.
This can be reproduced by playing several Scarabs, followed by playing none. Every scarab should revert to their current Full HP (1 in most cases, unless they've devoured other creatures or been buffed).
Screenshots below:
Previous to the first screenshot the AI played 2 Scarabs. The following turn the AI played a 3rd Scarab, thus the 3rd scarab (left most) has 3 HP because there are 3 Scarabs on the field. The other 2 scarabs only have 2 HP because they have 1 base HP + 1 scarab was played during that turn.
The second screenshot shows the AI after playing a Pharaoh. All 3 Scarabs revert to base (1) HP.
May be related to the Purify buff?