Perilous Forays | Omnath, Locus of Rage | Amulet of Vigor

Cards

Activate
Perilous Forays by paying ({1} magic symbol) and sacrificing a creature you control.
If the creature was an Elemental,
Omnath triggers, dealing 3 damage to any target.
Resolve the
Perilous Forays ability, searching your library for a land card with a basic land type and putting it on the battlefield tapped.
When the land enters the battlefield,
Omnath and
Amulet of Vigor trigger.
Resolve the
Omnath trigger, creating a creature token.
Resolve the
Amulet of Vigor trigger, untapping the land.
Activate the land by tapping it, adding ({1} magic symbol) .
Repeat.

Near-infinite damage.
Put all lands with a basic land type from your library onto the battlefield tapped.