Activate your commander by paying {2}{U}, causing your commander to become a copy of Mirror-Mad Phantasm until end of turn.
Activate your commander by paying {1}{U}, shuffling your commander into your library and milling your entire library due to it not having a card named Mirror-Mad Phantasm in it.

Infinite self-mill

Mirror-Mad Phantasm

Shameless Charlatan

Activate your commander by paying {2}{U}, causing it to  become a copy of Heronblade Elite until end of turn.
Activate your commander by tapping it, adding at least eight {U}.
Activate your commander by paying {2}{U}, causing it to become a copy of Morphling until end of turn.
Activate your commander's first ability by paying {U}, untapping it.
Repeat.

Infinite colored mana

Heronblade Elite

Morphling

Activate your commander by paying {2}{U}, causing it to  become a copy of Heronblade Elite until end of turn.
Activate your commander by tapping it, adding at least eight {U}.
Activate your commander by paying {2}{U}, causing it to become a copy of Horseshoe Crab until end of turn.
Activate your commander by paying {U}, untapping it.
Repeat.

Horseshoe Crab

Activate your commander by paying {2}{U}, causing it to  become a copy of Accomplished Alchemist until end of turn.
Activate your commander's second ability by tapping it, adding at least eight {U}.
Activate your commander by paying {2}{U}, causing it to become a copy of Morphling until end of turn.
Activate your commander's first ability by paying {U}, untapping it.
Repeat.

Accomplished Alchemist

Activate your commander by paying {2}{U}, causing it to  become a copy of Accomplished Alchemist until end of turn.
Activate your commander's second ability by tapping it, adding at least eight {U}.
Activate your commander by paying {2}{U}, causing it to become a copy of Horseshoe Crab until end of turn.
Activate your commander by paying {U}, untapping it.
Repeat.

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