Omniscience

Whenever a triggered ability of another
permanent you control triggers, the triggered abilities of up to two other target permanents you control are also triggered. Omniscience cannot
be targeted this way. If an ability was triggered
this way, you get a poison counter.
When Omniscience enters the battlefield, if you
both own and control Omniscience and an
enchantment named Omnipotence, exile them,
then meld them into Ego Death Supernova.