Necrosynthesis + Scurry Oak + Phyrexian Altar

Prerequisites

• Necrosynthesis attached to Scurry Oak.
• You control another creature to sacrifice.

Steps

1. 1Activate Phyrexian Altar by sacrificing a creature, adding one mana of any color.
2. 2Necrosynthesis triggers, putting a +1/+1 counter on Scurry Oak.
3. 3Scurry Oak triggers, creating a 1/1 Squirrel creature token.
4. 4Activate Phyrexian Altar by sacrificing the Squirrel token, adding one mana of any color.
5. 5Repeat from step 2.

Effects

• Infinite +1/+1 counters on a creature
• Infinite colored mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers