Giada, Font of Hope, Twilight Shepherd, and Phyrexian Altar

Prerequisites

• Giada, Font of Hope on the battlefield
• Twilight Shepherd on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Twilight Shepherd
2. When Twilight Shepherd dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Giada
3. Repeat

Results

• Infinite colored mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers