Astral Dragon | Springheart Nantuko

Cards

All permanents on the battlefield (
Springheart Nantuko attached to
Astral Dragon).

({1} magic symbol) if the land card in hand does not enter untapped and/or cannot produce mana available.

Play a land. When the land enters,
Springheart Nantuko and
Lotus Cobra trigger.
Holding priority, if the land enters the battlefield untapped, activate it by tapping it, adding at least ({1} magic symbol) .
Resolve the
Lotus Cobra trigger, adding ({G} magic symbol) .
Resolve the
Springheart Nantuko trigger, causing you to pay ({1} magic symbol) ({G} magic symbol) to create a token copy of
Astral Dragon.
When the
Astral Dragon token enters the battlefield, it triggers, creating two copies of a land you control that are 3/3 Dragon creatures in addition to their other types.
When the land tokens enter the battlefield,
Springheart Nantuko and
Lotus Cobra trigger twice.
Resolve both
Lotus Cobra triggers, adding ({1} magic symbol) ({G} magic symbol) .
Resolve the first
Springheart Nantuko trigger, choosing not to pay and creating a 1/1 Insect creature token.
Repeat from step 4 with the second
Springheart Nantuko trigger.

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