Llanowar Scout by tapping it, putting a land from your hand onto the battlefield.
The land enters the battlefield, triggering
Retreat to Coralhelm twice, untapping
Llanowar Scout and
Bloom Tender.
Activate
Bloom Tender by tapping it, adding at least ({G} magic symbol) ({U} magic symbol) ({R} magic symbol) .
Activate
Mina and Denn by paying ({R} magic symbol) ({G} magic symbol) and returning a land from the battlefield to your hand, giving a creature trample until end of turn.
Repeat.
Results
Infinite landfall triggers.
Infinite non-red and non-green mana among permanents you control.