Requires

Marath, Will of the Wild must be on the battlefield. Pir, Imaginative Rascal must be on the battlefield. Cryptic Trilobite must be on the battlefield. Marath has at least two +1/+1 counters on it. Mana needed:

Steps

1. Activate Marath by paying and removing a +1/+1 counter from it, giving itself two +1/+1 counters.
2. Activate Marath by paying and removing a +1/+1 counter from it, giving Cryptic Trilobite two +1/+1 counters.
3. Activate Cryptic Trilobite's first ability by removing a +1/+1 counter from it, adding that can only be spent to activate abilities.
4. Repeat for infinite +1/+1 counters on Cryptic Trilobite.
5. Activate Cryptic Trilobite's first ability by removing a +1/+1 counter from it, adding that can only be spent to activate abilities.
6. Activate Marath's ability by paying and removing a +1/+1 counter from it, giving itself two +1/+1 counters.
7. Repeat from step 5 to get infinite that can only be spent to activate abilities and to put infinite +1/+1 counters on Marath, with which you can use to activate Marath's ability infinite times.

Results