Dies to Removal

Suppose I cast a shardless agent and a Ethersworn Canonist is involved, will I be able to cast whatever I cascade into (say....think twice)

Fairly certain this works but I figure one of you would know

Yes, you can cascade off of Shardless Agent as long as Shardless Agent was the first spell you cast that turn. Canonist will only begin affecting you when you cast the first nonartifact spell during each turn.

Duly noted, thanks