COLORLESS
All is Dust - I tend to only really consider this if I am playing a LOT of artifacts or needing a wrath in green.
Ugin, the Spirit Dragon - Great for colorless decks obviously but beyond that I also like pairing it with higher cost cmc commanders where you can strip all the small stuff out from under your commander's cost. I tend to really start looking at it for any 5+ cmc commander.
Boompile - I think a lot of people really hate on this effect because its not guaranteed to work but what I do really like is that its cheap and can be utilized immediately for cheap. Sure its only 50% chance to work per activation but you still have the card if it doesn't work so you get another shot at it. It also makes it really awkward to keep playing into the board when you see this card hit play.
GREEN:
Ezuri's Predation really is under rated for green. It is a ton of mana but its in green so I assume you have some extra ramp. Some of these decks even care about tokens which in my opinion just makes this card even better as you might have things like
Doubling Season,
Earthcraft, or
Gaea's Cradle on the back of this effect.
BLUE:
Curse of the Swine - now, this isn't an actual wrath but the way I tend to play it makes it feel like one for me. It strips all of the key problem creatures out and replaces them with irrelevant 2/2s.
Cyclonic Rift - great tempo answer.
RED:
Blasphemous Act - It usually kills everything. When it doesn't you are about to die.
Immolating Gyre - Useful in spellslinger decks but those are rarely mono red.
Delayed Blast Fireball - I can't believe this card is an instant if I am being honest but hitting not your creatures at instant speed and the flexibility to hit for 5 is great.
Starstorm - versatile and can be cycled. Its useful.
BLACK:
Toxic Deluge - Flexibility is great and it can get past indestructible.
Damnation - Just cheap and consistent.
Living Death - I really love this as a wrath but generally only when I am playing some sort of sac based deck or self milling deck.
Pestilence /
Withering Wisps /
Crypt Rats - These can be really nice if you have a commander who is robust against these effects or cares about siphoning life from your opponents.
Blood on the Snow - I like that it can wrath and rez in one.
Kindred Dominance - Useful in tribal decks.
Blood Money - Its expensive but the treasure made from it might literally pay for its cost so its really good with the exception that it isn't usable until you get to seven mana.
Necromantic Selection - I like the sweep and rebuild idea.