The Zombie Cat doesn't have a -1/-1 counter on it and has base toughness 2 or greater.
Notable Prerequisites
You have at least seven cards in your graveyard.
Steps
Activate
Loot by sacrificing the Zombie Cat.
When the Zombie Cat dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
When the Zombie Cat enters,
Olag and Miau's first and second abilities trigger.
Resolve the first trigger, putting a +1/+1 counter on the Zombie Cat.
Resolve the second trigger, putting a +1/+1 counter on either a Zombie or Cat you control.
Resolve the
Loot ability, giving
Loot -2/-0 until end of turn.
Repeat.
Notes
You can use either
Olag and Miau trigger to put a +1/+1 counter on the Zombie Cat. The other ability can put the counter on any Zombie or Cat you control depending on which trigger is left.
Results
Infinite +1/+1 counters on certain creatures.
Infinite creature ETB.
Infinite creature LTB.
Infinite creature sacrifice triggers.
Infinite death triggers.
Infinitely powerful creature until end of turn.
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.