Doubling Season
{4}{G}
Enchantment
Oracle Text
If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead.
If an effect would put one or more counters on a permanent you control, it puts twice that many of those counters on that permanent instead.
Watch Out
Only counters that are 'placed,' not combat damageCommon Misplay
Doubling Season doubles counters only when an effect places them. Damage marked on creatures is not counters. However, effects that say 'put a +1/+1 counter' are doubled. Planeswalkers entering with loyalty counters IS doubled.
CR 122.6Only permanents YOU controlWatch Out
Doubling Season only applies to tokens and counters on permanents you control. If an opponent's effect places counters on your permanent, those are doubled. But counters placed on opponents' permanents are not.