Yurlok of Scorch Thrash, Umbral Mantle, and Heartstone

Prerequisites

• Yurlok of Scorch Thrash on the battlefield
• Umbral Mantle on the battlefield
• Heartstone on the battlefield
• Umbral Mantle attached to Yurlok of Scorch Thrash
• Yurlok of Scorch Thrash does not have summoning sickness
• available

Steps

1. Activate Yurlok of Scorch Thrash by paying and tapping it, causing each player to add Activate Yurlok of Scorch Thrash by paying and untapping it, causing itself to get +2/+2 until end of turn
2. Repeat an arbitrarily large amount of times
3. Move to your next step or phase, causing each player to lose life equal to the amount of unspent mana in their mana pool
4. Each player whose mana pool contained an amount of mana equal to or greater than their life total loses the game due to having 0 or less life

Results

• Infinite lifeloss
• Infinitely large Yurlok until end of turn
• Infinite green mana for opponents
• Infinite red mana for opponents
• Infinite black mana for opponents