Sundering TitanSundering Titan was recently singled out by Gavin Verhey as being potentially safe for Game Changer status, but ultimately it promotes such an unfun playstyle and can go into any deck that it's very unlikely to be unbanned without major community support
When an exploit creature enters the battlefield, the controlling player may sacrifice a creature, potentially triggering an effect on that card or others
Personally Im smitten by the Borderless Bloodstained Mire, but honestly any Bloodstained Mire is a good one
Doubling the triggers whenever your creatures deal combat damage to an opponent is huge, and you can double the card you draw or the cards they discard, among other abilities
This ensures at least 1000 to 2500 damage for a player rolling a 2-5 if they win, which is big damage that burn would like to take advantage of
Worldfire cost $15.70 this time last month, but it's now sitting at $35.45 (according to MTG Goldfish)