Sword of Hearth and Home and Sword of Feast and Famine attached to any other creature without summoning sickness.
Lands you control can tap to produce at least ({3} magic symbol) ({R} magic symbol) .
An opponent is unable to block and kill the creature with the Swords attached.
Steps
Deal combat damage to an opponent using the creature with Sword of Hearth and Home attached.
Sword of Hearth and Home and Sword of Feast and Famine trigger.
Resolve the Sword of Hearth and Home trigger, blinking Ardent Elementalist and causing you to search your library for a basic land card and put it onto the battlefield.
Ardent Elementalist enters the battlefield, returning Seize the Day from your graveyard to your hand.
Resolve the Sword of Feast and Famine trigger, causing you to untap all lands you control, and causing the defending player to discard a card.
Move to your postcombat main phase.
Activate any number of lands you control by tapping them, adding at least ({3} magic symbol) ({R} magic symbol) .
Cast Seize the Day by paying ({3} magic symbol) ({R} magic symbol) , causing you to untap the creature with Sword of Hearth and Home attached and to get an additional combat and main phase after this one.
Repeat.
Results
Infinite combat damage.
Infinite combat phases.
Infinite ETB.
Infinite LTB.
Infinite magecraft triggers.
Infinite storm count.
Infinite untap of lands you control.
Near-infinite landfall triggers.
Put all basic lands from your library onto the battlefield.