Timeline Culler either from your hand or from your graveyard for its warp cost by paying ({B} magic symbol) and 2 life.
When
Timeline Culler enters the battlefield,
Trostani triggers, causing you to gain 2 life.
Activate
Phyrexian Altar by sacrificing
Timeline Culler, adding ({B} magic symbol) .
Repeat.
Notes
If
Timeline Culler is in your hand, you can instead cast it normally and then cast it via its warp cost on each other iteration. This adds ({B} magic symbol) to the mana needed but removes the life requirement.
Results
Infinite creature LTB.
Infinite creature ETB.
Infinite creature sacrifice triggers.
Infinite death triggers.
Infinite lifegain triggers.
Infinite storm count.
Metadata
Bracket tag
OddballBracket 2-3+
Probably 2 or 3, 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.