Kilo, causing you to proliferate and put an eon counter on Magosi.
Activate
Nesting Grounds' second ability by paying and tapping it, moving an eon counter from Magosi onto
Nesting Grounds.
Activate Magosi's third ability by tapping it, removing an eon counter from it and returning it from the battlefield to your hand, causing you to take an extra turn after this one.
Play Magosi.
Move to your next turn.
Tap
Kilo by any method, triggering
Kilo, causing you to proliferate and put an eon counter on
Nesting Grounds.
Activate
Nesting Grounds' second ability by paying and tapping it, moving an eon counter from
Nesting Grounds onto Magosi.
Repeat from step 3.
Notes
If the method you are using to tap
Kilo has additional costs, you will also need to pay those costs each turn in addition to the needed to activate
Nesting Grounds.
Results
Infinite turns.
Metadata
Lock
Bracket tag
RuthlessBracket 4+
For competitive decks at brackets 4+
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.