Activate Chandra, Hope's Beacon's second ability by putting two loyalty counters on it, adding two mana of any color.
Activate Chandra, Bold Pyromancer's first ability by putting a loyalty counter on it, adding ({R} magic symbol) ({R} magic symbol) and dealing 2 damage to a player.
Activate The Chain Veil by paying ({4} magic symbol) and tapping it, allowing you an additional activation of your planeswalkers' loyalty abilities this turn.
Activate Tezzeret's first ability by putting a loyalty counter on it, untapping The Chain Veil.
Repeat.
Results
Infinite activations of loyalty abilities of all other Planeswalkers you control.