Firebender Ascension and the Earth King
Firebender Ascension does not trigger when you attack with a creature power 4 or greater while the Earth King is on your battlefield, which should as it is an attack that triggers an ability. It seems Firebender Ascension correctly triggers when an attacking creature triggers its own ability, but not when it triggers the ability of a different creature.
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ProfChoc#61222
shared this idea
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Rezzahan#77802
commented
"Whenever a creature you control attacking causes a triggered ability OF THAT CREATURE to trigger, ..."
So you would have to attack with The Earth King himself while a creature with power 4 or greater is also attacking (could be the King himelf if pumped up enough).