The Chain Veil + Carth the Lion + Kiora, Behemoth Beckoner + Ashnod's Altar + Chandra, Flamecaller

The Chain Veil
Carth the Lion
Kiora, Behemoth Beckoner
Ashnod's Altar
Chandra, Flamecaller

Requires
The Chain Veil must be on the battlefield. Carth the Lion must be on the battlefield. Kiora, Behemoth Beckoner must be on the battlefield. Ashnod's Altar must be on the battlefield. Chandra, Flamecaller must be on the battlefield.
Steps
  1. Activate Chandra's first loyalty ability by putting two loyalty counters on it, creating two 1/1 Elemental creature tokens.
  2. Activate Ashnod's Altar twice by sacrificing the Elementals, adding cccc.
  3. Activate The Chain Veil by paying 4 and tapping it, allowing an extra activation of your planeswalkers' loyalty abilities this turn.
  4. Activate Kiora by removing zero loyalty counters from it, untapping The Chain Veil.
  5. Repeat.
Results
Infinite activations of loyalty abilities of all other Planeswalkers you control. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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Enchantments (3)
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