Lieutenant Commander Data, and Phyrexian Altar

Prerequisites

• Lieutenant Commander Data on the battlefield
• Phyrexian Altar on the battlefield
• if all three of the persist or undying creatures have a -1/-1 or +1/+1 counter on them respectively available

Steps

1. If any of the creatures with persist or undying do not have a -1/-1 or +1/+1 counter on them respectively, activate Phyrexian Altar by sacrificing the creature, adding one mana of any color
2. When the creature dies, its persist or undying ability triggers, returning the creature from your graveyard to the battlefield with either a -1/-1 or +1/+1 counter on it
3. Repeat from step 1 until all three persist or undying creatures have a counter on them
4. Activate Data by paying and removing a counter from each of the persist or undying creatures, causing you to draw a card
5. Repeat

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite colored mana
• Near-infinite creature ETB
• Near-infinite creature LTB
• Near-infinite creature sacrifice triggers
• Near-infinite death triggers