Artifact Castable for that survives in hand or on the battlefield or in your library (on top of your library).
All other permanents on the battlefield.
Steps
Sacrifice the templated artifact.
Resolve the
Extruder ability, putting a +1/+1 counter on
Arcbound Reclaimer.
Remove a +1/+1 counter from
Arcbound Reclaimer, putting the artifact on top of your library.
Cast the templated artifact for 0 life through
Bolas's Citadel.
Repeat.
Notes
This combo will only result in creature ETB/LTB/etc. if the chosen card from the template is an artifact creature, in which case creature-specific sacrifice outlets may also be used.
For artifacts from the template that can sacrifice themselves, the free sacrifice outlet is unnecessary.
Results
Infinite +1/+1 counters on creatures you control.
Infinite artifact ETB.
Infinite artifact LTB.
Infinite artifact sacrifice triggers.
Infinite creature ETB.
Infinite creature LTB.
Infinite creature sacrifice triggers.
Infinite storm count.
Metadata
Bracket tag
PowerfulBracket 3+
For strong decks in bracket 3+
1
2
3
4
5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.