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| Format | Legality |
| 1v1 Commander | Legal |
| Alchemy | Legal |
| Arena | Legal |
| Block Constructed | Legal |
| Canadian Highlander | Legal |
| Casual | Legal |
| Commander / EDH | Legal |
| Commander: Rule 0 | Legal |
| Custom | Legal |
| Duel Commander | Legal |
| Gladiator | Legal |
| Highlander | Legal |
| Historic | Legal |
| Historic Brawl | Legal |
| Legacy | Legal |
| Leviathan | Legal |
| Limited | Legal |
| Modern | Legal |
| Modern Beyond Horizons | Legal |
| Oathbreaker | Legal |
| Pauper | Legal |
| Pauper Duel Commander | Legal |
| Pauper EDH | Legal |
| Pioneer | Legal |
| Planar Constructed | Legal |
| Pre-release | Legal |
| Standard | Legal |
| Standard Brawl | Legal |
| Tiny Leaders | Legal |
| Vintage | Legal |
Sanguine Syphoner
Creature — Vampire Warlock
Whenever this attacks, each opponent loses 1 life and you gain 1 life.
TheForsakenOne on
Omnath, locus of all
3 days ago
You need a lot more cards that trigger Omnath, ideally you want to be hitting it every single turn but with lands that's already not going to happen. You barely have 6 cards in the deck that he'll trigger on, and while he will still draw you a card each turn you want to be adding that free mana. If you want a more goodstuff commander I'd recommend switching to Kenrith, the Returned King as a card that has more general value.
You seem to have a lot of just bad cards in here, giving the impression that you built this out of the cards you have lying around. Everyone has to start there, I did the same when I was starting out, but a lot of these go straight to the cutting floor. Aegis Turtle, Campus Guide, Sanguine Syphoner, Gutless Plunderer, Scytheclaw Raptor, Stromkirk Bloodthief, Hoverstone Pilgrim, Misleading Motes, Pilfer, Navigation Orb, Prophetic Prism, Tithing Blade Flip, and Clawing Torment are all on this list.
You also seem to have a weird sacrifice subtheme with Ravenous Amulet, Vampire Gourmand, Dreg Recycler, Ayara, First of Locthwain, Vein Ripper, and Liliana, Dreadhorde General. The problem with this is that you just don't have good token generators or sacrifice fodder to support this outside of Liliana, not to mention its complete disconnect from the Omnath theme. I'd cut them all except for Liliana and Vein ripper since those are just good cards by themselves.
For other miscellaneous cuts: Rest in Peace is probably unnecessary for the power level you're looking to play at, most of the time it's going to sit dead in your hand. You don't really have enough enter the battlefield effects for Blur to pull its weight. And you don't really seem to be putting out creature numbers necessary for Campaign of Vengeance to be worth the 5 mana. Invasion of Ravnica Flip is a decent card but the flip cares about 2 color pairs which seems out of place in this deck.
And are you sure you want to keep the infinite combo? Your deck is very low power, while that wincon is something more akin to something higher up. People are going to see you pull off the infinite out of nowhere and then have the perception of your deck based off of that when it'll probably only do it once every dozen or so games. I heavily suggest cutting Marauding Blight-Priest to avoid this.
For what you should add:
Pick and choose from the and cycles, those are pretty consistent 3 color spells that trigger Omnath.
Other suggestions: Villainous Wealth lets you turn all that mana into free spells of your opponents deck. A wincon in of itself.
Rienne, Angel of Rebirth if you put in more multicolored legends then this is a godsend, letting you play them over and over.
Maelstrom Nexus triggers Omnath and is just a really good card for casting big things like you want to.
Kodama's Reach is a second cultivate, which you definitely want.
Mirror Room / Fractured Realm copies a creature or doubles the triggers of all your stuff, including your commander.
Conflux tutors you three cards which is just great and with all the mana you should have you can have a nasty turn with this.
Annie Joins Up is removal and doubles your commander trigger. Also triggers Omnath's draw.
Wargate lets you tutor out whatever Permanent you need directly onto the battlefield, and is a good X spell for all your mana. Also see Chord of Calling or Rocco, Cabaretti Caterer for creatures specifically.
Yurlok of Scorch Thrash is great for adding a ton of mana over several turns. Also triggers Omnath
Sphinx's Revelation to turn that mana into a ton of lifegain and card draw.
Victory Chimes nets you 4 mana a turn with Omnath.
Koma, World-Eater is just a big guy that creates a bunch of tokens and is hard to get rid of. Also triggers Omnath.
Faeburrow Elder is another bloom tender that's also a 5/5 for 3 if you have a decent board.
Aragorn, the Uniter loves you casting multicolored spells because he'll trigger multiple times for each.
Zacama, Primal Calamity can be devastating with the amount of mana you can store. You can cripple your opponents with a string of her abilities.
Muldrotha, the Gravetide is great for recursion to spend all that mana. You'll basically never run out of things to play.
From your Maybeboard: Kroxa and Kunoros should be fun, and Polukranos Reborn Flip is just a decent creature that also triggers Omnath. Rebuild the City is decent mega ramp that also creates bodies. If you add enough 3 color stuff Meeting of the Five would be great for a massive turn (I would also suggest Threefold Signal if you hit that level). Everything else I don't think is worth adding, you seem to have ambitions for Battle synergy but most of those don't trigger Omnath, I think that would be better saved for another deck.
Tl;Dr: Add more stuff that triggers Omnath and cut out the bulk. Add more ramp and think long and hard about if you do really want that infinite in a deck that cannot match it's power level and the hate it will bring on you.