The Chain Veil + Ashnod's Altar + Ral Zarek + Chandra, Flamecaller

The Chain Veil

Ashnod's Altar

Ral Zarek

Chandra, Flamecaller

How it works

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 Ral Zarek's first loyalty ability by putting a loyalty counter on it, untapping The Chain Veil.
5. Repeat.

This elegant engine relies on Chandra, Flamecaller to continuously flood the board with fuel via her first loyalty ability, which generates the two Elemental tokens needed to feed Ashnod's Altar for four colorless mana. You then channel that mana directly into The Chain Veil, whose activated ability bypasses the normal once-per-turn restriction on planeswalker activations. This opens the door for Ral Zarek to step in with his +1 ability, untapping The Chain Veil so the cycle can begin anew. Together, these pieces create an infinite loop that gives you boundless activations for your planeswalkers alongside an endless stream of creature sacrifices, enter-the-battlefield, and leave-the-battlefield triggers.