Jinnie Fay, Jetmir's Second, Requiem Angel, and Phyrexian Altar

Prerequisites

• Jinnie Fay, Jetmir's Second on the battlefield
• Requiem Angel on the battlefield
• Phyrexian Altar on the battlefield
• You control another non-Spirit creature

Steps

1. Activate Phyrexian Altar by sacrificing any other non-Spirit you control, adding one mana of any color
2. The creature dies, triggering Requiem Angel, creating either a 2/2 Cat or a 3/1 Dog creature token
3. Repeat

Results

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