Cast Quasiduplicate by paying {1}{U}{U}, creating a token copy of Deadeye Navigator.
The Deadeye Navigator token enters the battlefield, triggering its soulbond ability, pairing it and Ixidron.
Activate Ixidron by paying {U}, blinking it.
All other nontoken creatures you control are turned face-down as Ixidron enters the battlefield.
Ixidron enters the battlefield, triggering the token Deadeye Navigator's soulbond ability, repairing Ixidron and the token Deadeye Navigator.
Activate Rattleclaw Mystic's morph ability by paying {1}, turning it face up.
Rattleclaw Mystic triggers, adding {G}{U}{R}.
Repeat from step 3.

Infinite creature ETB

Infinite green mana

Infinite creature LTB

Infinite red mana

Rattleclaw Mystic

Ixidron

Deadeye Navigator

Training Grounds

Quasiduplicate

Cast Cackling Counterpart by paying {1}{U}{U}, creating a token copy of Deadeye Navigator.
The Deadeye Navigator token enters the battlefield, triggering its soulbond ability, pairing it and Ixidron.
Activate Ixidron by paying {U}, blinking it.
All other nontoken creatures you control are turned face-down as Ixidron enters the battlefield.
Ixidron enters the battlefield, triggering the token Deadeye Navigator's soulbond ability, repairing Ixidron and the token Deadeye Navigator.
Activate Rattleclaw Mystic's morph ability by paying {1}, turning it face up.
Rattleclaw Mystic triggers, adding {G}{U}{R}.
Repeat from step 3.

Heartstone

Cackling Counterpart

Cast Croaking Counterpart by paying {1}{G}{U}, creating a token copy of Deadeye Navigator that is a 1/1 green Frog.
The Deadeye Navigator token enters the battlefield, triggering its soulbond ability, pairing it and Ixidron.
Activate Ixidron by paying {U}, blinking it.
All other nontoken creatures you control are turned face-down as Ixidron enters the battlefield.
Ixidron enters the battlefield, triggering the token Deadeye Navigator's soulbond ability, repairing Ixidron and the token Deadeye Navigator.
Activate Rattleclaw Mystic's morph ability by paying {1}, turning it face up.
Rattleclaw Mystic triggers, adding {G}{U}{R}.
Repeat from step 3.

Croaking Counterpart

Combos with "Ixidron"