Here is your deck designed to take out Bant Ramp in Best of One, and does fine against the meta in general!
Now fixed to take care of mono-red and similar aggro decks.
Climbed the Platinum ranks to Diamond
Features that beat Ugin Ramp:
Stonecoil Serpent. As a 4/4 or greater, neither Nissa nor Ugin nor Teferi 3 scare it.
Agonizing Remorse. Discard a planeswalker or Uro or anything else.
Casualties of War. Wreckage all around. Nothing like killing Nissa, a land and another land!
Negate. Counter the planeswalker.
Murderous Rider. Kill those walkers
Scavenging Ooze, Erebos's Intervention. Prevent ECD or Tamiyo or Uro from recovering cards from the graveyard.
Extinction Event. Exile all those creature lands, or Uro, or Dream Trawler
Shark Typhoon. Surprise them with a big attacker.
Questing Beast. Kill from the untap.
Fae of Wishes. A variety of sideboard targets to answer whatever troubles you.
Narset, Parter of Veils. Cripple both Teferis, Uro, Krasis
To beat this deck, play patient. Plan how you are going to deal with what's on the board, not with getting their life low. Keep killing their things, and use things like Ooze and Extinction Event to control the graveyard. In general you beat their walkers by attacking into them, and occasionally with a Murderous Rider. Often, a single creature is more than enough trouble for them, but sometimes play out several.
Features that beat Mono Red aggro
8 sweepers
Extinction Event, Cry of the Carnarium - also great against Rakdos, and serviceable against early Green. ((against control decks, discard these to Fae or Chemister's.))
Assorted spot removal including Erebos's Intervention to gain life
Cheap, scalable creatures: Scavenging Ooze, Knight of the Ebon Legion, Stonecoil Serpent, Fae of Wishes. Play them out any opportunity you get to slow them down.
Beefy blockers: Questing Beast, Shifting Ceratops, Yorion
Matchups
Bant Ramp - favored
Other Ramp - depends on the build
Temur Reclamation - slightly unfavored
Rakdos Sac - favored
Red Aggro - even
Auras - favored
Peer Combo - unfavored. Need more enchantment removal.
Green Aggro - slightly unfavored
Cycling - even