I've been playing with rishadan ports as a 3x in my former versiona and now I'm testing mutavaults. I'd got to say that vaults offer a little advantage versus some decks ( counterslivers in particular), but I'm not still convinced that they're better than my ol' ports. Sometimes i just realized that a further beater was just unnecessary and i'd rather have had a port to mana-deny my oppo, while other times i won games thanks to mutavault.
What do you guys think about those 2 lands ? Do you think it's possible to find a configuration which packs both ? i was thinking to something like 3 wastes, 2 ports and 3 vaults to add both, but in this case i'd have to cut a waste and i think it's the only colorless land which deserves an automatic 4-ofs; moreover, i don't want to cut too many islands, since we need them to play daze and , sometimes, hardcast Lord. I'm convinced that, without port, the deck loses too much of its strength ( the disruption part) to play more like "goblin-esque " tribe style. On the other side, it's also true, for example, that goblins can afford to play ports because of lackey that cheats mana, while we're not that fast.
I tried to look on merfolks that made top8 on DeckCheck.net and i noticed that many are turning their ports into Mutavaults, while others are still keeping a mixed tuning. However, there's no one still playing only ports without mutavaults, that's for sure, but still I'm not totally convinced.
@ Phoenix Ignition: does really Whirlpool Rider deserve a 2 slots in that deck ? i think they're wassted. I mean, it's surely a good card if you draw it into lategame while you have plenty of dead cards, in hand, but what about having it in your initial hand ? you'd have to shuffle eventual good cards to draw, maybe, some shit. It's too risky IMO, just depending on strokes of luck-or unluck.
Not to consider that he'd always remain a cc2 1/1 (almost) vanilla creature, and i think that , at this point, there are other merfolks with way more interesting abilities.
If i was going to run rider, i would not go over the 1-of. There are way more stronger merfolks (both in body and in abilities) to abuse, rather than that one.

