Cackling Counterpart + Heartstone Combos

1 known combo featuring both cards in Commander

Infinite ETB Infinite green mana Infinite LTB Infinite red mana

Combo 1 with Rattleclaw Mystic + Ixidron + Deadeye Navigator

Results: Infinite ETB · Infinite green mana · Infinite LTB · Infinite red mana
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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