Incubation Druid, Kinnan, Bonder Prodigy, and Umbral Mantle

Prerequisites

• Incubation Druid on the battlefield
• Kinnan, Bonder Prodigy on the battlefield
• Umbral Mantle on the battlefield
• Umbral Mantle attached to Incubation Druid
• Incubation Druid does not have summoning sickness
• Incubation Druid has at least one +1/+1 counter on it

Steps

1. Activate Incubation Druid's first ability by tapping it, adding three mana of any color a land you control could produce
2. Kinnan triggers, adding one mana of the color produced by Incubation Druid
3. Activate Incubation Druid by paying and untapping it, giving itself +2/+2 until end of turn
4. Repeat
5. If you gain infinite and this way, you may activate Kinnan's ability an arbitraily large number of times

Results

• Infinitely large Incubation Druid until end of turn
• Infinite mana lands you control can produce
• Put all non-Human creatures from your library onto the battlefield