Twilight Drover, Phyrexian Altar, and Biomancer's Familiar

Prerequisites

• Twilight Drover on the battlefield
• Phyrexian Altar on the battlefield
• Biomancer's Familiar on the battlefield
• Twilight Drover has at least one +1/+1 counter on it
• available

Steps

1. Activate Twilight Drover by paying and removing a +1/+1 counter from it, creating two 1/1 Spirit creature tokens
2. Activate Phyrexian Altar by sacrificing a Spirit, adding
3. When the Spirit dies, Twilight Drover triggers, putting a +1/+1 counter on itself
4. Repeat

Results

• Infinite +1/+1 counters on Twilight Drover
• Infinite colored mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers