Torrent Elemental might be worth including with some temple of deceits and murderous cuts. Just tapping the opponent's field upon attack with that many elemental tokens usually just kills. Also running Torrent with Mirror Mockery eliminates the risk of master of waves being blocked when you swing with Mirror, and replenishes your supply of blockers. And murderous cut can be used to exile torrent if it dies to bring it back, and who doesn't like kill spells?

What do you think about Mirror Mockery?

You can put it on the Ensouled Citadel to create an Indestructible 5/5 til the end of turn, or on the creature your steal with the Siren or on the Master of Waves (MOOOOAARR TOKENS, YEEEEAAAHHHHH!!!!).

It also keeps increasing devotion :)

btw, nice deck, +1 dude ;)

I'm really liking this deck. It's very resilient to spot removal thanks to the mishmash of hexproof, morph/unmorph and indestructible threats. Ensoul Artifact + Darksteel Citadel garners free wins on occasion or eats up their banish removal, allowing other threats to stick around.

My only modification is moving the swamp to the sideboard to minimize the amount of non-blue lands. Erebos was cut to make room, but Black lifegain decks have been rough so I may need to rethink it.

From your experience, how does Clever Impersonator help? Copying Master of Waves is of course nice, as can be copying Cloudform. I haven't come across cards on the opponent's side yet that I've really wanted to copy.

Looking forward to playing this deck more. Thanks!