Checking something

[Alexzang, etherium envoy]

{ethersworn canonist} out, opponent casts {maelstrom wanderer}. The cascade triggers either A) resolve, but he must choose to put them in the bottom, Or B) don't resolve. What happens?

[Keyeto]

Basically, A.

The cascade will find the card to cast, and your opponent will not cast it. The revealed cards will go to the bottom. It will be treated as if they chose not to cast the card.

Edit: This is, of course, assuming that the chosen spell is a non artifact spell.

[Alexzang, etherium envoy]

Basically, A.

The cascade will find the card to cast, and your opponent will not cast it. The revealed cards will go to the bottom. It will be treated as if they chose not to cast the card.

Ok wasn't sure because I know you can force your opponent to do anything unless a card effect says so, and this didn't seem like it would work.