Resolve both Retreat to Coralhelm triggers, untapping Llanowar Scout and choosing either to untap another creature or scry 1.
Activate a land by tapping it, adding at least ({1} 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.