Marath, Will of the Wild + Earthcraft + Dawn's Reflection
Marath, Will of the Wild
Earthcraft
Dawn's Reflection
Infinite colored manaInfinite creature tokensInfinite damageInfinite death triggersInfinite creature ETBInfinite creature LTBInfinite storm countInfinite untap of basic lands you controlInfinite creature tokens that are infinitely largeInfinite +1/+1 counters on creatures you control
How it works
Activate the enchanted land by tapping it, adding 1.
Dawn's Reflection triggers, adding an additional 2.
Activate Earthcraft by tapping an untapped creature, untapping the enchanted land.
Activate Marath by paying 1 and removing a +1/+1 counter from it, creating a 1/1 Elemental token.
Repeat until Marath has no more +1/+1 counters.
Marath dies due to having 0 toughness and goes to the command zone.
Cast Marath by paying plus commander tax.
Marath enters the battlefield with a number of +1/+1 counters equal to the amount of mana spent.
Repeat any number of times.
Once you have infinite mana, you may activate Marath any number of times, choosing any value for X.