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Granted, its non-tokens only, but at minimum creatures that already enter with counters come in with more, and any deck relying on counters (energy, experience, etc.) gets a steady flow of extra counters simply by playing creatures

On a colorless one that makes two a turn

There arent many flexible tutors for this combo, but if Birgi is your Commander, then Grinning Ignus essentially becomes a one-card combo

The most well known example would be Desert Ruins from EX Hidden Legends, which requires each player to put a damage counter on each of their Pokmon-ex with a maximum HP of 100 or more between turns

Suitable for 8 years and up, there are no new cards in here.

In some ways it may even end up helping your opponents more if they need mana fixing