Will they trigger?
Let’s say I have [[Sunbird's Invocation]] and [[Veyran, Voice of Duality]] on the battlefield. Then I cast a sorcery with mana value 10.
The first trigger from [[Sunbird's Invocation]] lets me cast [[Rite of the Dragoncaller]], and the second trigger lets me cast [[Chandra, Hope's Beacon]].
Will [[Chandra, Hope's Beacon]] and [[Rite of the Dragoncaller]] also trigger from the 10 mana sorcery, since that spell is still considered on cast ?