How can you create a combo with Encroaching Mycosynth, Goblin Welder, Tezzeret the Seeker, Second Wind?
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[START OF COMBO]This combo can be formed with Encroaching Mycosynth, Goblin Welder, Tezzeret the Seeker, Second Wind

Color identity: UR
Mana cost: 
Steps:
  1. Activate Goblin Welder by tapping it, sacrificing Second Wind and returning Tezzeret the Seeker from your graveyard to the battlefield.
  2. Activate Tezzeret the Seeker's first ability by putting a loyalty counter on them, untapping Goblin Welder and any other nonland permanent.
  3. Activate Goblin Welder by tapping it, sacrificing Tezzeret the Seeker and returning Second Wind from your graveyard to the battlefield attached to Goblin Welder.
  4. Activate Second Wind's last ability by tapping it, untapping Goblin Welder.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite untap of nonland permanents[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Encroaching Mycosynth must be on the battlefield
  - Goblin Welder must be on the battlefield
  - Tezzeret the Seeker must be in the graveyard
  - Second Wind must be on the battlefield
  - Goblin Welder does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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