You have more cards in hand than your maximum hand size.
Steps
Proceed to your next cleanup step, causing you to discard cards down to your maximum hand size.
Containment Construct triggers for each card discarded this way. Resolve the first trigger, exiling the discarded card.
Ketramose triggers, causing you to draw a card and lose 1 life.
Sheoldred triggers, causing you to gain 2 life.
Resolve all remaining
Containment Construct abilities, if applicable, choosing not to exile anything.
Once the stack has emptied and all players pass priority, you will still be in the cleanup step and thus need to discard cards down to your maximum hand size.
Repeat from step 2.
Results
Infinite self-discard triggers.
Near-infinite lifegain triggers.
Infinite draw triggers.
Infinite rummaging.
Near-infinite lifegain.
Metadata
Bracket tag
ExhibitionBracket 1+
For any deck
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.