All permanents in hand or on the battlefield or in exile (Exiled by the creature on the battlefield).
Easy Prerequisites
Phantom Steed must be exiled by
Lagrella, and
Abdel Adrian must begin in hand.
(This starting order is not fixed, and their initial positions may be interchanged as necessary.).
Mana Needed
plus the mana cost of the creature in your hand available.
Steps
Cast
Abdel Adrian for its mana cost.
When
Abdel Adrian enters, it exiles
Lagrella until
Abdel Adrian leaves the battlefield. Resolve any additional effects of
Abdel Adrian's ETB.
When
Lagrella leaves the battlefield,
Phantom Steed is returned from exile to the battlefield.
When
Phantom Steed enters, it exiles
Abdel Adrian until
Phantom Steed leaves the battlefield. Resolve any additional effects of
Phantom Steed's ETB.
When
Abdel Adrian leaves the battlefield,
Lagrella is returned from exile to the battlefield.
When
Lagrella enters, it exiles
Phantom Steed until
Lagrella leaves the battlefield. Resolve any additional effects of
Lagrella's ETB.
When
Phantom Steed leaves the battlefield,
Abdel Adrian is returned from exile to the battlefield.
Repeat from step 2.
Notes
Due to differences in card templating between the various banisher effects (linked triggered abilities vs "until" clause), steps 3, 5, and 7 may return the creature to the battlefield during the resolution of the preceding step rather than creating a separate event. This should not affect the overall execution of the combo, only how many objects pass through the stack (and thus rounds of priority available per loop).
Results
Infinite blinking of nonland permanents.
Infinite creature ETB.
Infinite creature LTB.
Infinite creature tokens.
Metadata
Bracket tag
SpicyBracket 3-4+
Probably 3 or 4, but hard to classify
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.