Selfless Squire enters the battlefield, its first ability triggers, preventing all damage that would be dealt to you this turn.
Cast
Wheel of Misfortune by paying , selecting an arbitrarily large number, and dealing that much damage to you if you chose the largest number, which is prevented due to
Selfless Squire.
Selfless Squire's second ability triggers, putting a number of +1/+1 counters on it equal to the damage prevented.
If you didn't choose the largest number,
Wheel of Misfortune deals damage equal to that number to each opponent who chose that number.
Results
Infinite +1/+1 counters on a creature.
Metadata
Bracket tag
OddballBracket 2-3+
Probably 2 or 3, but hard to classify
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1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.