Elbrus, the Binding Blade // Withengar Unbound + Walking Ballista + Agatha's Soul Cauldron + Corrupted Conscience

Elbrus, the Binding Blade // Withengar Unbound

Walking Ballista

Agatha's Soul Cauldron

Corrupted Conscience

How it works

1. Deal combat damage to an opponent using Withengar Unbound, causing them to get at least ten poison counters.
2. The opponent loses the game as a state-based action due to having ten or more poison counters.
3. Withengar Unbound triggers, putting thirteen +1/+1 counters on it.
4. Activate Withengar Unbound using Walking Ballista's second ability by removing a +1/+1 counter from it, giving an opponent a poison counter.
5. Repeat step 4 until the opponent loses the game as a state-based action due to having ten or more poison counters.
6. Repeat from step 3.

This fascinating loop transforms Elbrus, the Binding Blade into the terrifying Withengar Unbound and enchants it with Corrupted Conscience, giving it infect so its combat damage easily dispatches an opponent via poison counters. Once that player loses the game, Withengar Unbound’s triggered ability dumps thirteen +1/+1 counters onto it, creating a massive reservoir of fuel. Agatha's Soul Cauldron bridges the gap by granting creatures with those counters the activated abilities of exiled creatures—specifically borrowing Walking Ballista's counter-removal ability. You can then repeatedly strip those +1/+1 counters to deal damage, applying lethal poison counters and triggering Withengar Unbound infinitely over and over.