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Worst:

Dredge: you're just decking yourself out, making you weak against Dimir's decking cards.

Best:

Transmute: search for the card you need (the cost limitation is no problem at all), it's actually SO broken I'm surprised they let it pass... well they let pass Affinity in the past so R&D isn't perfect...

i agree with your ranking of the mechanics but i disagree with your scoring/reasoning.

Transmute is very powerful because of T1. it gives 3 different cards that could look for YawgWin or whatever. it is pretty amazing.

i don't get what you said about Dredge. "... like drawing twice, paying some mana..." the only mana you pay is when you play the stuff you Dredged again. it is a very powerful ability in a sense that it's very synergistic. if you've seen a dedicated Dredge deck, it can run with a scary effectiveness as it is very persistent.

i think they're both around a 9 and 8 respectively.

1. decking only matters when the last card is put into the graveyard AND the player has to draw. until that point, think of Dimir as helping the Dredge player to get what he wants. a dedicated Dredge deck will Dredge Stinkweed Imp (Dredge 5) without batting an eyelash.
2. Svogthos will usually roll over the opposing deck with minimal resistance.

Wrong again. Tokens kick a** for Convoking stuff. Why do you think the Convoke mechanic just happened to go with the Token guild... That's right. Convoke works by tapping ANY creature, including Tokens. So all you really need to worry about is what color your Token creatures are. And in a working Token deck that means you could be up against a pair of Autochthon Wurm's by turn 6 or 7. Ouchtastic.

That's why the list should look like:
- Transmute
- Dredge
- Convoke
- Radiance

Radiance is by far the worst mechanic. In tournament play, and almost any other play, you're bound to hit a deck playing the same colors you are, especially since Boros seems to be a very popular guild to run with.

And Convoke is also not an expensice affinity. But, if you'd like to compare it to that, Convoke would be most like an Affinity for Creatures. The whole mechanic just begs to be overused to pump out giant creatures early in the game, and I'm sure we're going to see it happen more and more. There's no reason for people not to "break" the Convoke mechanic through mass-production of Tokens, which simply become mana producers of a sort.

And as for Dredge... yes, definitely a GREAT mechanic. You keep bringng back old threats, and your opponent is going to get frustrated. Especially when you have a few Golgari Grave-Trolls and Svogthos, the Resltess Tomb and your opponent is going to have SERIOUS trouble. You keep dredging to fuel your Troll and Tomb, and eventually your opponent won't have anything to slow you down.

Convoke is not that bad in my opinion. In W/G you are probably running 16-20 creatures plus Scatter the Seeds with Doubling Season in not really that bad. Like previously stated Coat of Arms is deadly with how many tokens you're pumping out with Vitu Ghazi. I mean 1 token for 2WG is in perspective bad but with 4 Doubling Seasons makes it worth it. Also with Glare of Subdual who cares? Tapping down your opponents creatures then swinging with an army of 100 100/100 sapoling tokens is pretty hard to deal with.

Dredge is okay. Transmute is quite possibly the best because you can tutor for a Jitte with an Infiltrator and then there's my unblockable Infiltrator with a Jitte.

Radiance is bad unless you have a bunch of creatures that are the same color or something like that.

raidiance is bad a**

use it damage spells on multi color creatures it will hit all the colors, target a tiny 2 color creature they wont think much of it till it hurts all of em

Dredge, all the way. My Dredge based deck makes my friends crenge as all their favorite decks are chunkers. Its to the point where people refuse to play against my dredge deck because it's so cheap.

Deck Combos:
Necroplasm and Shambling Shell = Evergrowing Necroplasm
Golgari Guildmage and Scatter the Seeds = Dredge replacement when library is low
Sovgthos, the Restless Tomb and Stinkweed Imp = Defensive Power Combo, Stinkweed Imp destroys flyers and dredges for cards into my graveyard and if I ever get into a bind against a non flyer, animate Sovgthos for some heavy defense, if I dredged enough.
Mortipede and Gaze of the Gorgon = Destroy all their creatures
Golgari Grave Troll and... Wait, if you're playing a dredge deck and you can't find a good time to play this at any point of the game in any shape or form, then you don't have a good dredge deck, honestly.
Infectious Host and Golgari Rotworm = 3 damage sacs for 1 black mana. Good for end game when they're reeling, add Savra, Queen of the Golgari into the mix and you get a devistating end game assault, even if you're not sacrificing infectious hosts.

As you can see, it all works well together in a dredge deck. Using the Guildmage and Vigor Mortis can make your deck truely shine as you can use creatures without Dredge in this deck with simular effect. However, as you notice, my deck seems to be lacking in the spell department, making artifact and enchantment destruction rather difficult, along with ZERO counterspells in my deck, making me very vulnerable to such things. Though, I think I might be getting off topic now. But let me end with this thought:

Dredge can be played at ANY time you draw a card, meaning that with proper additions, you can add to the dredge stratagy by finding draw cards to add in, making multi dredges per turn.

if you stray to past blocks what about dredge and nefarious lich?that could me somewhat good, if you dont screw up and remove the wrong card( like id do)