MTG >Combos >Crystalline Crawler +Mairsil, the Pretender +Goblin Bombardment +Endling +

Exile both creatures with Mairsil Pay one black mana to give Undying to Mairsil Sacrifice Mairsil with Goblin Bombardment to deal 1 damage to the opponent Undying's ability will trigger, return Mairsil to the battlefield Pay one mana and remove a +1/+1 Counter from Mairsil to add one black mana. Repeat the process for infinite damage.