Glorybringer Would not exert
In the power cube, evoked a fury targeting a manifested card and an abhorrent oculus. Assigned 2 dmg to each killing the manifested card and marking 2 dmg onto oculus, then cast a glorybringer and attack. There was no option to exert the glorybringer as it attacked to deal 4 to the oculus and kill it. My gloybringer could not trade up with the oculus for the rest of the game causing me to lose.
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Rezzahan#77802
commented
To exert an on-attack exert creature, you have to assign it individually as attacker, not as part of a set, even if it would be the only creature in the set. So no "attack all" and the like. You can attack with however many creatures you want still, the exert creature simply cannot be part of a group declaration. Groups cannot be exerted, only individual attackers can. So declare a goup like "attack all", unselect the exert creature, then select it individually and exert it, then attack with them all.
The reason for this is likely, that a group can have multiple on-attack exert creatures, and you would have to choose to exert them or not individually anyway.