Ratadrabik of Urborg | Leyline of Singularity | Vesuvan Shapeshifter

Cards

Cast
Vesuvan Shapeshifter by paying its mana cost. Choose to have it enter as a copy of
Ratadrabik.
Put
Vesuvan Shapeshifter into your graveyard due to the legend rule.
When
Vesuvan Shapeshifter dies,
Ratadrabik triggers, creating a token copy of
Vesuvan Shapeshifter that is a copy of
Ratadrabik but is a 2/2 Zombie in addition to its other types.
Repeat from step 2 using the
Vesuvan Shapeshifter token instead.

This combo produces a mandatory infinite loop that'll cause the game to end in a draw if it isn't interacted with.

Bracket tag

OddballBracket 2-3+

Probably 2 or 3, but hard to classify

Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.

Popularity

deck on EDHREC

Variants

variants of this combo

Salt

Too few votes

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