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
Teferi's first ability by putting a loyalty counter on it, untapping
The Chain Veil and causing you to gain two life.
Repeat.
Results
Infinite colored mana.
Infinite untap of permanents you control.
Infinite damage.
Infinite lifegain triggers.
Infinite lifegain.
Infinite activations of loyalty abilities of all other Planeswalkers you control.