This looping setup turns a single ping from Deathbringer Thoctar into a self-sustaining engine of damage and card draw. By enchanting Deathbringer Thoctar with Snake Umbra, its damage dealt to an opponent immediately replaces its own cost by triggering a card draw. That newly drawn card instantly activates Lyla, Holographic Assistant to replenish the +1/+1 counter on Deathbringer Thoctar, allowing you to repeat the process to burn down any target.