Quickbeam, Upstart Ent, Devoted Druid, Spawnsire of Ulamog, and Maskwood Nexus

Prerequisites

• Quickbeam, Upstart Ent on the battlefield
• Devoted Druid on the battlefield
• Spawnsire of Ulamog on the battlefield
• Maskwood Nexus on the battlefield
• Devoted Druid does not have summoning sickness
• available

Steps

1. Activate Spawnsire of Ulamog's first ability by paying , creating two 0/1 Eldrazi Spawn creature tokens
2. When the Eldrazi Spawns enter the battlefield as Treefolk due to Maskwood Nexus, Quickbeam triggers twice, giving Devoted Druid and up to one other creature +4/+4 until end of turn
3. Activate Devoted Druid's first ability by tapping it, adding
4. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it
5. Repeat from step 3 three additional times
6. Repeat from step 1

Results

• Infinite colorless mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite green mana
• Infinite LTB
• Infinitely large creatures until end of turn
• Infinite sacrifice triggers