Clement, the Worrywort | Intruder Alarm

Cards

Creatures you control can tap to produce at least ({G} magic symbol) ({W} magic symbol) ({U} magic symbol) .

Activate any number of creatures you control by tapping them, adding at least ({G} magic symbol) ({W} magic symbol) ({U} magic symbol) .
Cast Ambrosia by paying ({1} magic symbol) ({W} magic symbol) .
When Ambrosia enters the battlefield, it,
Clement and
Intruder Alarm trigger.
Resolve the
Intruder Alarm trigger, untapping all creatures.
Holding priority, activate any number of creatures you control by tapping them, adding at least ({G} magic symbol) ({W} magic symbol) ({U} magic symbol) .
Resolve the
Clement trigger, returning nothing to your hand.
Resolve the Ambrosia trigger, returning
Clement from the battlefield to your hand.
Cast
Clement by paying ({1} magic symbol) ({G} magic symbol) ({U} magic symbol) .
When
Clement enters the battlefield, it and
Intruder Alarm trigger.
Resolve the
Clement trigger, returning Ambrosia from the battlefield to your hand.
Resolve the
Intruder Alarm trigger, untapping all creatures.
Repeat.

You can tap Frogs for mana thanks to
Clement. This should be factored in when determining if you have enough mana to execute the combo.

This combo has been estimated to be Exhibition (Bracket 1+).