This format doesn't have a mill deck, and players can exile cards with one of the main mechanics, so I'm skeptical Drown in the Loch will work out here
If Nulldrifter is countered or otherwise leaves the stack in response to that triggered ability, the triggered ability will still resolve as normal
(11/10/2020) No matter what spell you cast with the first cascade trigger (or with any cascade triggers that result from casting that spell), the second cascade trigger will look for a spell with mana value less than Maelstrom Wanderer's mana value of 8
Standard-only sweepers tend to never go over $10, if a quick spike occurs, but seems to always settle at $4 or $5
Dont let anyone tell you otherwise
Everybody who goes to a prerelease gets one, and having the date of the event engraved on the card generally isn't a big enough difference to make them exciting to collectors