Arcbound Reclaimer + Showdown of the Skalds + Urza's Bauble + Bolas's Citadel
Arcbound Reclaimer
Showdown of the Skalds
Urza's Bauble
Bolas's Citadel
Infinite artifact ETBInfinite artifact LTBInfinite artifact sacrifice triggersInfinite card draw at the beginning of the next upkeepInfinite draw triggers at the beginning of the next upkeepInfinite +1/+1 counters on a creatureInfinite +1/+1 counters on Golems you control
How it works
Cast Urza's Bauble either from your hand by paying 0 or from the top of your library by paying 0 life.
Showdown of the Skalds triggers, putting a +1/+1 counter on Arcbound Reclaimer.
Activate Urza's Bauble by tapping and sacrificing it.
Activate Arcbound Reclaimer by removing a +1/+1 counter from it, putting Urza's Bauble from your graveyard onto the top of your library.
Repeat.
This fascinating loop centers around Bolas's Citadel, which lets you gaze at the top of your library and cast spells from it by paying life instead of mana. With that powerful engine active, you can cast Urza's Bauble for free right off the top of your library, triggering Showdown of the Skalds's second and third lore chapters to place a +1/+1 counter on Arcbound Reclaimer. You then sacrifice Urza's Bauble to draw a delayed card, allowing Arcbound Reclaimer to immediately strip that newly placed +1/+1 counter and recycle the bauble right back onto the top of your library. Repeating this process creates an endless cycle of artifact triggers and counter accumulation while feeding the Citadel's life-payment constraints.