Activate Wall of Limbs by using Walking Ballista's ability by removing a +1/+1 counter from it, dealing 1 damage to any target and causing you to gain 1 life due to its lifelink.
Wall of Limbs triggers, putting a +1/+1 counter on it.
Repeat.

Infinite damage

Infinite lifegain triggers

Infinite lifegain

Agatha's Soul Cauldron

Walking Ballista

Wall of Limbs

Gain life.
Wall of Limbs triggers, putting a +1/+1 counter on it
All Will Be One triggers, dealing 1 damage to an opponent.
Exquisite Blood triggers, causing you to gain 1 life.
Repeat from step 2.

Infinite +1/+1 counters on a creature

Infinite lifeloss

All Will Be One

Exquisite Blood

Cause a creature to enter the battlefield under your control.
Ajani's Welcome triggers, causing you to gain 1 life.
Wall of Limbs triggers, putting a +1/+1 counter on itself.
Animation Module triggers, causing you to pay {1} to create a 1/1 Servo artifact creature token.
The Servo enters the battlefield, triggering Ajani's Welcome.
Holding priority, activate Ashnod's Altar by sacrificing the Servo, adding {C}{C}.
Resolve the Ajani's Welcome trigger, causing you to gain 1 life.
Repeat from step 3.

Infinite colorless mana

Infinite creature tokens

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Animation Module

Ajani's Welcome

Ashnod's Altar

Activate Wall of Limbs using Spike Feeder's second ability by removing a +1/+1 counter from it, causing you to gain 2 life.
Wall of Limbs triggers, putting a +1/+1 counter on it.
Repeat.

Spike Feeder

Give Shalai and Hallar lifelink, if needed.
Gain life.
Wall of Limbs triggers, putting a +1/+1 counter on it.
Shalai and Hallar triggers, dealing damage to an opponent and causing you to gain life.
Repeat from step 3.

Card That Gives Lifelink

Shalai and Hallar

Search Results