Missy, Phyrexian Altar, and Kolaghan Stormsinger

Prerequisites

• Missy on the battlefield
• Phyrexian Altar on the battlefield
• Kolaghan Stormsinger on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Kolaghan Stormsinger, adding
2. When Kolaghan Stormsinger dies, Missy's first ability triggers, returning Kolaghan Stormsinger from your graveyard to the battlefield face down as a 2/2 Cyberman artifact creature
3. Activate Kolaghan Stormsinger's morph ability by paying , turning it face up and putting a +1/+1 counter on it
4. Kolaghan Stormsinger triggers, giving a creature you control haste until end of turn
5. Repeat

Results

• Exile your library
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers