Glinthorn Buccaneer, Broadside Bombardiers, Shao Jun, Sawblade Skinripper, even off-type solutions like Mayhem Devil or Ghirapur Aether Grid are all nice tools to accelerate games and give you and out if the table is a bit too strong to chip down with random pirate and vehicle swings
Smothering Tithe While it's gained new tools recently, white isn't a colour known for its mana ramp cards
The ramp comes in many forms, from Dragon cost reduction in Dragonlords ServantDragonlords Servant and Dragonspeaker ShamanDragonspeaker Shaman, to rocks like Arcane SignetArcane Signet and Atarka MonumentAtarka Monument, to land fetchers like CultivateCultivate and Sakura-Tribe ElderSakura-Tribe Elder
1Camaraderie
The games of Sealed Deck I played afterwards left me with the same observations
Delirium At the beginning of your end step, you may exile any number of cards from your graveyard with four or more card types among them