How can you create a combo with Experiment Kraj, Devoted Druid, Hardened Scales?
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[START OF COMBO]This combo can be formed with Experiment Kraj, Devoted Druid, Hardened Scales

Color identity: GU
Mana cost: 
Steps:
  1. Activate Experiment Kraj by tapping it, putting two +1/+1 counters onto Devoted Druid.
  2. Activate Experiment Kraj using Devoted Druid's last ability by putting a -1/-1 counter on itself, untapping it.
  3. Activate Experiment Kraj's own ability, putting two +1/+1 counters on itself.
  4. Remove the -1/-1 counter and one of the +1/+1 counters from Experiment Kraj as a state-based action.
  5. Repeat steps 2 through 4 any number of times, resulting in any number of +1/+1 counters on Experiment Kraj.
  6. Activate Experiment Kraj using Devoted Druid's last ability by putting a -1/-1 counter on itself, untapping it.
  7. Activate Experiment Kraj using Devoted Druid's first ability by tapping it, add {G}.
  8. Repeat steps 6 and 7 any number of times.
  9. You may also activate Experiment Kraj's own ability any number of times instead of step 7, putting any number of +1/+1 counters onto creatures.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters
  - Infinite green mana[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Experiment Kraj does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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