Agatha's Soul Cauldron Bug
Agatha's Soul Cauldron bug
Agatha's Soul Cauldron will properly give a creature an activated ability when it is tapped and Agatha's Soul Cauldron paces the +1/+1 counter on that creature.
However, if a creature gets the +1/+1 counter in another way, ie via Teachings of the Kirin or the backup ability, the creature will not get the activated abilities that are related to Agatha's Soul Cauldron even though the card reads that
Creatures you control with +1/+1 counters on them have all activated abilities of all creature cards exiled with Agatha's Soul Cauldron.
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Alvaro#81835 commented
Sometimes if the same ability is on a creature twice, that ability cannot be activated. e.g. If you have Omen Hawker in the game with 1 +1/+1 counter and 1 Omen Hawker exile with Agatha's then Omen Hawker cannot be tapped for mana or if you have 2 Omen Hawker with Agatha's in exile you can use another one don't tap for mana.