The one addition is that we consider the faction symbols in the bottom right corner of the Contraptions to be watermarks
A 3/2 flyer that effectively couldn't be blocked was pretty much a bomb, since there were few removal spells, fewer fliers, and virtually no tempo in this format
Sure, Thassas Oracle is not the best typal support for Merfolk decks, but saying its not the best Merfolk in Commander is almost strictly wrong
Creature - Sphinx Kangee's Lieutenant Flying Whenever this creature attacks, attacking creatures with flying get +1/+1 until end of turn
Any time one of your slivers might be destroyed, just flip a coin and theres a chance itll survive
Hakbal, the Surging Soul himself, does a lot in this regard, allowing each merfolk to explore at the start of your combat