Surly Badgersaur and Skirge Familiar on the battlefield.
You have at least two additional land cards in hand.
({R} magic symbol) available.
Steps
Activate Forgotten Cave's cycling ability by paying ({R} magic symbol) and discarding it.
Surly Badgersaur's second ability triggers, creating a Treasure artifact token.
Resolve the Forgotten Cave ability, causing you to mill three cards and return Life from the Loam from your graveyard to your hand.
Activate Skirge Familiar by discarding a land card, adding ({B} magic symbol) .
Surly Badgersaur's second ability triggers, creating a Treasure artifact token.
Repeat from step 4 one additional time.
Activate two Treasure tokens by tapping and sacrificing them, adding ({R} magic symbol) ({G} magic symbol) .
Cast Life from the Loam by paying ({1} magic symbol) ({G} magic symbol) , returning Forgotten Cave and two other lands from your graveyard to your hand.
Repeat.
Results
Infinite self-mill.
Near-infinite colored mana.
Near-infinite magecraft triggers.
Near-infinite self-discard triggers.
Near-infinite storm count.
Near-infinite Treasure tokens.
Near-infinite untap of permanents you control.
Near-infinite mana permanents you control can produce.