Cackling Counterpart + Training Grounds Combos

2 known combos featuring both cards in Commander

Infinite ETB Infinite LTB Infinite colored mana Infinite creature tokens Infinite green mana

Combo 1 with Palinchron + Vadrok, Apex of Thunder

Results: Infinite colored mana · Infinite ETB · Infinite LTB · Infinite creature tokens
Steps
  1. Cast Palinchron.
  2. When Palinchron enters the battlefield, you can untap 7 lands.
  3. untap lands to produce {2}{U}{U}{W/U}{R}{R}.
  4. Cast Vadrok, Apex of Thunder for its mutate cost under Palinchron.
  5. When Vadrok, Apex of Thunder successfully mutates you can cast Cackling Counterpart from your graveyard for free.
  6. Cast Cackling Counterpart from your graveyard to make a token copy of Palinchron.
  7. When the token copy of Palinchron enters the battlefield in response to its ability, return the original Palinchron to your hand with its ability.
  8. Repeat.

Combo 2 with Rattleclaw Mystic + Ixidron + Deadeye Navigator

Results: Infinite ETB · Infinite green mana · Infinite LTB · Infinite red mana
Show steps
  1. Cast Cackling Counterpart by paying {1}{U}{U}, creating a token copy of Deadeye Navigator.
  2. The Deadeye Navigator token enters the battlefield, triggering its soulbond ability, pairing it and Ixidron.
  3. Activate Ixidron by paying {U}, blinking it.
  4. All other nontoken creatures you control are turned face-down as Ixidron enters the battlefield.
  5. Ixidron enters the battlefield, triggering the token Deadeye Navigator's soulbond ability, repairing Ixidron and the token Deadeye Navigator.
  6. Activate Rattleclaw Mystic's morph ability by paying {1}, turning it face up.
  7. Rattleclaw Mystic triggers, adding {G}{U}{R}.
  8. Repeat from step 3.
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