Urza's Saga can tap to produce at least ({2} magic symbol) .
The number of artifacts you control plus
Arwen's toughness is equal to or greater than 9.
Steps
Activate any number of lands except
Urza's Saga by tapping them, adding at least ({2} magic symbol) .
Activate
Urza's Saga's second ability by paying ({2} magic symbol) and tapping it, creating a 0/0 Construct artifact creature token that gets +1/+1 for each artifact you control, and that enters the battlefield with a number of +1/+1 counters equal to
Arwen's toughness.
When the Construct enters the battlefield,
Verdant Sun's Avatar triggers, causing you to gain at least 10 life.
Activate the Construct using
Beledros Witherbloom's ability by paying 10 life, untapping all lands you control.
Repeat.
If other lands you control can tap to produce at least ({3} magic symbol) , this combo nets infinite mana.
Results
Infinite creature tokens.
Infinite ETB.
Infinite lifegain.
Infinite lifegain triggers.
Infinite mana lands you control can produce.
Infinite untap of lands you control.
Infinite power and toughness for certain creatures.